Holley 750 Hp Jet Size

OEM jet sizes are included in the kit and kits are based off of U. Primary jets i put in are stock holley jetting followed by 10 higher on rear. Holley carburetor specifications, list numbers, stock jetting, and tuning tips. This fine tuning resulted in the 700-hp mark being surpassed. My edelbrock gave me 12 mile per gallon. Get the best deals on Auto Performance Carburetors when you shop the largest online selection at eBay. 750 HP GAS Based on the Holley® #80528-1 1. The engine will be at my house next week. Holley is proud to introduce the all new Aluminum Street HP. But the Holley-type jets in. From a simple rebuild and wet flow, converting to a blow through application, changing fuels, porting, or a complete machining and re work we can help you get the most from your combination. If you need a new jet kit consider the following or try a repair kit. Holley has been the undisputed leader in fuel systems for over 100 years. 0s @99mph with this carb. Replaces Holley 4160 750-cfm carburetor P/N 12485506; Chevrolet Logo High-Performance Design. The Size of the engine can be in Cubic Inches or Cubic Centimeters. Here we have gathered all of the currently available Holley Carburetor Specs 4150 HP Series. Service replacement for 1967 L34 w/o A. the proper way to jet up after removal of the power valve is to measure the area of the power valve channel restriction, add this the the jet area being run, and. i also dropped jet sizes and i will. Barrels: 4 Booster: Down Leg Brand: Holley CFM: 750 Choke: None Circuit: 2 Emission Code: 3 Finish: Gold Dichromate Fuel: Gasoline Fuel Inlet: Dual Material: Zinc Model: 4150 Primary Main Jet: 73 Primary Power Valve: 6. At WOT, the power valve unseats, and opens a fixed orifice, dumping a fixed amount of fuel in addition to the main jet. I just purchased a stock(as far as I know) 454 in a 1992 21 foot carrera bow rider with berkeley jet drive. 0s @99mph with this carb. Specifications. Not saying Holley is better than Edelbrock, just when putting extra ponies in there, it responds much better with the 750 cfm than the 600 cfm. it's full time main metering. This fine tuning resulted in the 700-hp mark being surpassed. 95 / 23% off X-PRO ® 27mm PZ27 Carburetor Repair Kits for ATV, Dirt Bike, Go Kart. With several features not seen before, the new carburetor was a hot commodity for the mild street-performance vehicle. It has been sonic cleaned & rebuilt using genuine Holley parts. We have a large selection of show-quality carburetors for Classic and/or Muscle cars. For every 2000 foot increase in altitude, you can reduce the jet size by one size. 5l Bearings Rebuild Piston Hp Powerhead Kit Mercury Oring V6 Sportjet 240 Efi Piston Efi 2. And lose the three inch duals for some 2 one million/4-one million/2 inch to velocity up exhaust velocity and help scavenge for extra backside end and MPGs. Jet size selection for the Autolite is more limited than with the Holley. Holley has been the undisputed leader in fuel systems for over 100 years. chevyhiperformance. The difference between a Street HP and a reoular HP-series carb lands mostly in the factory tune-up ,and it. Holley 4-barrel carburetor dated 2853 - 285=October, 3=1973. 7 L/350 CID 6. 5 p/v front & rear. It is the 'shiny' version of the normal die cast Holley. On the dyno, we had run a Holley 950 HP double-pumper, and it had performed flawlessly. Holley HP Series carburetors are available in sizes ranging from 350 to 1,000 cfm. that size a carb. Running 7psi fuel pressure and fuel level is a bit over half on sight glass. All Holley Marine Carburetors are designed to meet Coast Guard specifications. plug it and go 7 to 8 jet sizes. HOLLEY PERFORMANCE 0-82751 Street HP Carburetor 750cfm Mech Sec Double Pumper - $552. i also dropped jet sizes and i will. These performance calibrated gasoline four barrel carbs are race ready, right out of the box. Several Tuners done there Homework and transferring over 750 HP and 900 NM TQ over the Gearbox. 5l Sport Jet Rebuild Kit - 100-21-215 -. A different local shop can get the Mighty Demon 750 mech secondaries for ~$500. 750" stroke combo with a Performer RPM intake that made peak power at 6400 rpm, the scfm number on the dyno sheet at that rpm was 747. com and check the specs, you'll be surprised this is true. Current setup is a 468, hydrolic roller, 10. the 750 or possibly a seven hundred is the place you will be. It is on a 10. The generally accepted range is a two- to three-percent change in flow per jet size. Gas Jet Kit includes: Two (2) each of thirty-six (36) different jet sizes, ranging from #64 to #99. Only at www. For every 2000 foot increase in altitude, you can reduce the jet size by one size. The motor is a 396/375 HP motor,I wasnt sure it was large enough for the motor?. The main metering restrictions, in the end carb metering plates, are. 19s Performer RPM airgap intake. Since we had misgivings about the true streetability of a double pumper, we had fitted a Holley Avenger 830 CFM vacuum-secondary for street use, where it worked OK. Comes small parts bag, 2- Needel & Seats,2- 50cc gas diaphrams and all the none sticks gaskets for gas carb. Also it delivers results just a squeak shy of those produced by a Holley 950 Ultra HP, which in itself is an outstanding carb. Plug 7 and 8 filthy black on cruising. This Chevy 505-ci big-block sported two tricked-out 750 Holley carbs. 5 4160 2818-1 600 (f)65,(r. HO0-82751SA HOLLEY 750CFM Double pumper 4150 Aluminum Street HP Carburetor - $950. If you have the time put down your modifications ,jet size, idle air bleeds what ever. Holley Street HP carb too rich at idle. We fine tune a Mighty Demon 750 Carburetor for the street with our 383 small-block test engine. The main body uses a radiused air entry. 89 gear, 28" tires, 3300 lbs) It was almost perfect out of the box for mine. i have remedied that and i figured while i had it all apart i would check the transfer slots on my carb. 075" diameter 120 pill size is usually about. Followed by rear notched float & jet extensions. The Street HP features the contoured main body from the 4150 HP™and has a tumble polished shiny finish and screw in air bleeds for precision tuning capabilities. A PV in the front barrels properly tailored to your vacuum really makes them work much better transisioning to and off part throttle and WOT bursts! Dodgem! geewhiz wrote: > I've never quite been able to find out why Holley puts power valves in. Also, the Holley HP 950 uses the 850/950 base with a 750 main body, go to holley. The difference between a Street HP and a reoular HP-series carb lands mostly in the factory tune-up ,and it. When it comes to jet sizing, the number size of a jet does not correlate with the diameter. Any help on this would be appreciated. Buy Holley 0-82751 at JEGS: Holley Street HP Carburetor 750 cfm. However, with the tall, sticky French Drag Radials installed, the car would fall on its face. Holley 4053 4-barrel carburetor dated 833 - 8=1968, 3=March, 3=3rd week. Holley's HP Series four barrel carburetors set the standard in oval track race carbs. All the features of Holley HP Series plus so much more. Jet kits provide a selection of jet sizes to make it easy to add/reduce the amount of fuel/air mixture. Here we have gathered all of the currently available Holley Carburetor Specs 4150 HP Series. 028 and still very little change. When a big cam is used and idle speeds are in the range of 950 to 1,200 rpm, use of the hole 2 or 3 is usually more appropriate. 5l Powerhead V6 Mercury Bearings Hp Kit Oring Rebuild 240 Sportjet $1,099. The Street HP features the contoured main body from the 4150 HP™ and has a tumble polished shiny finish and screw in air bleeds for precision tuning capabilities. The 475 Holley Truck Avenger would come real close to being a "bolt it on and go". It varies with 2300 2-bbls and 4150/4160/4180 depending on the configuration. 750 (1-3/4) Down Leg 180 86 93 70 28 Mechanical Secondary / Gas SERIES PRIMARY SECONDARY THROTTLE BORE Booster Style Booster Size Prim Jet Sec Jet Idle Bleed. If they are adjustable how do you know what size to use, etc. With this in mind, your carb/cam will need 2-3 sizes bigger jets on the primaries. No matter what you're driving, we have the right Holley 750 3310 for your vehicle. C-4 automatic transmission with stock lock up converter (I know, it will be going away soon!). dur 288/294 lift 520/540. Hi I did some searching on this site and not sure what the general feeling is on the Proform Main body. I went ahead and ran it too see how it would work. At sea level, jets from 70-72 is about right for that carb, but it will still seem rich and get poor mpg. With the size of cam your running it should be idling close to 1000 rpm. Hg, "85" indicates 8. Part of the flow discrepancy (half of 750 cfm is 375 cfm, not 500) is because Holley uses a test depression of 1. These performance calibrated gasoline four barrel carbs are race ready, right out of the box. Ive found that larger bleeds seem to sign off early,before the main jet starts to work,but if you up the MAIN or High Speed bleed. The main body has a radiused air entry instead. Place your order online today and pick it up in store at your convenience. They utilize the best features from Holley's Race Bred 4150 HP carbs, but are tamed for street and light competition use. If you have a 4spd and 3. Holley is proud to introduce the all new Aluminum Street HP™. 5-1 Forged pistons, Edelbrock performer RPM, rect heads. look at one of thier hp carbueretors, which is the 950 dbl pumper on my truck. 5 p/v front & rear. My questions are: 1. For most applications, where the idle speed screws are nearly closed and idle speeds are in the 550 to 750 range, securing the cam via hole 1 is best. Goes great ! But I have this cool brand new Holley 750HP sitting in my garage off my old motor, AND I dont want to. 687 (1-11/16) Down Leg 160 74 82 73 36 Mechanical Secondary / Gas RQ-750-AN 1. 050) we're trying to replace the q-jet with a Holley ultraHP 750 double pumper. Holley 0-80537 Model 4150 750 CFM Four Barrel Marine Carburetor with Mechanical Secondaries All Holley Marine Carburetors are designed to meet Coast Guard specifications. 043 bs30/96 n151. Very interesting information. look at one of thier hp carbueretors, which is the 950 dbl pumper on my truck. FORD and MUSTANG Holley 4150 Carburetors C3AE-B list 2668 427, C3AF-BE list 3255 65 Ford Full Size 427, C3AF-BV list 3255-1 66 - 67 Ford Full Size 427, C5AF-BV list 3255-1 66 - 67 Fairlane 427, C6OE-N list 3557 66 Fairlane / Comet 390, C6OE-M list 3530 66 Fairlane / Comet 390, C7OF-A list 3793 67 Mustang 390, C7OF-B list 3794 67 Mustang 390, C7OF-C list 3795 67 Mustang 390, C7OF-D list 3796 67. HO0-82751SA HOLLEY 750CFM Double pumper 4150 Aluminum Street HP Carburetor - $950. Running 7psi fuel pressure and fuel level is a bit over half on sight glass. The other 3310's (-2 thru -7) were 4160's which had #134-21 metering plates,. The HP kit came with a 72/84 jet combo so I am 7 jet sizes larger all the way around. AFR 195 heads, Performer RPM intake, Holley Street HP 750 mechanical secondaries pn 82751 4 corner idle, comp cam xr 288 roller cam. Each of the carburetors we tested was from Holley's HP line, and included a 650 Street HP, a 750 Street HP, a 950 Ultra HP, and a -1,000 HI). Order now by calling 845-651-7389 or at www. I am getting ready to put my motor in my 19' jet boat, the motor is a 396 with a decent cam ( on the higher scale of "mild" but not radical) the motor is balanced and according to the machine shop will make 500 hp no problem, I think realistically 400 -450 hp, I had a circle track BLP 800 holly that I had a carb shop rebuild with marine components, I ended up selling it because I really just. But they can wake up an engine. Alcohol Jet Kit includes: Four (4) each of twenty-four (24) different jet sizes, ranging from. Raise or lower primary jet sizes by 2 sizes at a time and repeat this test until your plugs are showing the correct color. Big Or Even Bigger - 750 Vs. They utilize the best features from Holley’s Race Bred 4150 HP™ carbs, but are tamed for street and light competition use. HP / Holley Jet Environmental Correction By Bowling The following computation determines jet size changes for Holley carburetors based on environmental conditions. Free shipping. I have a Holley 4150 Street HP 750 which has the adjustable air bleeds. 17 Mercury 210 Hp 2. 052″ (left and right) in both cases. The four carbs were: Stock 750 Q-jet, 500cfm Holley 2bbl, 650 Holley 2bbl,800 Holley Dbl Pumper 4bbl & a 600 Holley 4bbl. Includes notched float and jet extensions; Holley 750 Street Hp vac sec. At WOT I can hear just a very slight detonation that I did not hear before. This Chevy 505-ci big-block sported two tricked-out 750 Holley carbs. 12/1/00 Courtney Hook For those of you who don't know it, you can drill your jets out for larger sizes instead of spending big bucks to acquire a vast selection. 4 foot-pounds of torque at 3,290. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA Pro-Stock champion for four decades. I know I need to go down but don't wanna order #61-69 jets if I need a #60. Also realize that a bone stock Holley 80496 950 double pumper is only flowing a tad over 800 cfms in most applications. Engine is a 401 that has 450+ hp @6500rpm. New or modified fuel lines are required (previously bowl machining was 7/8-20, Aluminum Ultra HP carburetors come assembled with -6AN to SAE 8 port fittings). 606 b42/55 n208. 025 Secondary Sq. to get what they need to make sales. 5-1 Forged pistons, Edelbrock performer RPM, rect heads. This has the factory Holley calibration and jetting. I tried larger jets but got detonation so settled with 76's my deal was 9. And, one correction to your comment: the 250 HP 327 used a Rochester "4-Jet", not a quadrajet. We fine tune a Mighty Demon 750 Carburetor for the street with our 383 small-block test engine. Each of the carburetors we tested was from Holley's HP line, and included a 650 Street HP, a 750 Street HP, a 950 Ultra HP, and a -1,000 HI). Holley's HP Series four barrel carburetors set the standard in oval track race carbs. 76-84 jets 4. HP / Holley Jet Environmental Correction By Bowling The following computation determines jet size changes for Holley carburetors based on environmental conditions. sorry for my lack of activity, my engine developed a light knock. If it doesn't have one, I believe they have provisions to accept one. Holley has been a best-selling subject for years, and this much-needed update guides you through the traditional 4150 Double Pumper, Dominator, and 4160 vacuum secondary models, as well as all the recent releases from Holley, including the Ultra Street Avenger and Ultra HP Series Carbs. The Holley Carburetor is available with trimmed throttle shafts and blueprinted metering rods. Or a 750 Edelbrock/Carter if you like those. Screwdriver is supplied for idle bypass adjustment. In all reality a 390 Holley would probably be just about perfect. Here we have gathered all of the currently available Holley Carburetor Specs 4150 HP Series. 606 b42/55 n208. Holley identification tags are mounted along the right (passenger) side of the carburetor on the choke assembly. Holley ran a comparison on 4carbs on a stock 69Chevelle w/325HP 396 (L-35) w/10. christiondavid Joined: If you mis-match HP metering blocks with a non-HP main body there can be a fuel leak through the metering block gasket into that vac advance port. fuel and should help clean up the idle. The metering system includes a timed spark port for a vacuum advance distributor and is calibrated. The Street HP features an aluminum contoured main body design taken from the race winning 4150 HP™ and has a tumble polished shiny finish and screw in air. 95 / 23% off X-PRO ® 27mm PZ27 Carburetor Repair Kits for ATV, Dirt Bike, Go Kart. Shop for Holley 750 cfm Square Bore 4BBL Carburetor Part #: 080576S for your vehicle. HP rating approximately 475 - 500 My carb is a Holley 850 double pumper, mech. 049 heads with 2. Note: This is only a rough estimator of carb sizing. Holley techs have told me that it's wrong to compare jet sizes across different model carbs, because, say, an 86 jet will flow differently in your 830 than in the 1000 and my 750. 100% Holley - Made in the USA. Engine 1 was a 408, afr205, 10-1, vic jr. 1968 C3 Corvette Overview. The test was four Holley XP series carbs, 650, 750, 850 and 950 CFM. What we ultimately found was that Holley had this carburetor made its best power right at a 13:1 air/fuel ratio. A different local shop can get the Mighty Demon 750 mech secondaries for ~$500. Holley 4150 Supercharger Carburetor — designed for use with superchargers, this carburetor offers many of the same features as the HP version above, but with a. It varies with 2300 2-bbls and 4150/4160/4180 depending on the configuration. Also it delivers results just a squeak shy of those produced by a Holley 950 Ultra HP, which in itself is an outstanding carb. Holley Alcohol Jet Set For 750-950 Cfm Hp1050 Dominator96 Jets. Can you provide present jet sizes and fuel emissions readings. I am getting ready to put my motor in my 19' jet boat, the motor is a 396 with a decent cam ( on the higher scale of "mild" but not radical) the motor is balanced and according to the machine shop will make 500 hp no problem, I think realistically 400 -450 hp, I had a circle track BLP 800 holly that I had a carb shop rebuild with marine components, I ended up selling it because I really just. that size a carb. They utilize the best features from Holley's Race Bred 4150 HP™ carbs, but are tamed for street and light competition use. All Holley’s lack the following features, standard on a Rochester Quadra jet: Metering rods for power enrichment, air door controlled secondary. 45 Carburetor Rebuild Kit Fit For Holley 4160 Carbs 390 600 750 850 CFM 1850 3310 Carburetor Rebuild Kit. Crude, but simple and effective. I can get either the Holley 750 HP 0-80528-1 or the Holley 750 HP 0-80529-1 for ~$600 from a local shop. Primary Jet Size: 74. Street carbs and performance carbs of the same cfm rating will be jetted differently, too, so you can't always use the jet rating for different. 76-84 jets 4. 650-750 Butterfly# 172 Pri. People have been scratching their heads for years wondering why it's called a 950. So I donk it in my Torana. Number of Barrels 4 Primary Discharge Nozzle Size (in) 0. Holley understands this and has created the Brawler line of carburetors for those who are looking for a unit that can make big power, without taking a huge bite out of their bank account. FBO/Quick Fuel Carburetor Size and Series Chart. 5 Primary Sq. Street carbs and performance carbs of the same cfm rating will be jetted differently, too, so you can't always use the jet rating for different. 101 Inch Drill Size - 2 Pack, HO122-86 SPO3827025. The Street HP™ uses the best features from Holley's race Bred 4150 HP™ carbs, but tamed for street and light competition use. Specifications. Front 4 plugs spot on. When changing jet sizes up or down, go two number sizes larger or smaller rather than one to see if it helps or hurts performance. Holley is proud to introduce the all new Aluminum Street HP™. Not everybody needs or can afford a pair of split Dominator carburetors for their car to make big power. It has been sonic cleaned & rebuilt using genuine Holley parts. If the cam is also stock, that 750 Holley is just using extra gas on there. Several Tuners done there Homework and transferring over 750 HP and 900 NM TQ over the Gearbox. At sea level, jets from 70-72 is about right for that carb, but it will still seem rich and get poor mpg. Holley Ultra HP 750 tuning tips not tricks Engine 1 was a 408, afr205, 10-1, vic jr. When it comes to jet sizing, the number size of a jet does not correlate with the diameter. Note: Jet hole sizes provided below are for reference only. Holley manufactures each carburetor with a set of jets that. Any ideas roughly where to start? It's a 1977 351w with 78 heads, weiand stealth intake. At WOT I can hear just a very slight detonation that I did not hear before. Also, the Holley HP 950 uses the 850/950 base with a 750 main body, go to holley. The Street HP features the contoured main body from the 4150 HP™ and has a tumble polished shiny finish and screw in air bleeds for precision tuning capabilities. Last time I used the carb I used 85 and 86 jets, but the main body I had did not have downleg boosters. In about 80 percent of cases, a carb calibrated by Holley needs only minor main jet recalibration. If larger jets hurt performance, go the other way and decrease the size of the jets until the engine feels stronger. Classic Japanese Bike 1983 Kawasaki KZ1100 100 HP air cooled motor Shaft drive so it’s smooth with very low maintenance. About 325 HP i would guess. Ok i have the 950 hp i have run 7. Also realize that a bone stock Holley 80496 950 double pumper is only flowing a tad over 800 cfms in most applications. Holley HP carburetors are the standard for square bore race carburetors. Powering the biggest names in NASCAR to the Saturday night racer, HP carburetors are the perfect choice for all types of motorsports. 325 kN/m2, 101. I have just recently installed a Holley HP main body on a "good" 750 carb 4779-5. HOLLEY 750 DOUBLE PUMP STREET HP. I have set up the floats and adjusted the secondary butterflies for the idle and it seems to now run well at low to mid revs. All Holley jets are sized by actual flow and may vary slightly from the sizes listed. sorry for my lack of activity, my engine developed a light knock. Holley Carburetor Specs 4150 HP Series. Tweak your idle screws. Even a 550-600 Holley will run quicker and be way better on gas. because you have to jet it down so far to get it to run right and not foul the plugs because of to much gas unless its built 650 or 750 would be the right carb for the street you can start with 70 in front and 72 in rear is a good starting point, the thing to do is get a jet kit. 5 4160 1850-4 600 (f)66,(r)plate 134-9 6. I have entered the relevant details into the holley calculator and it comes back with a 750 vac sec. These jets will not fit the standard Holley metering block; they are designed to fit only the 750 and 950 CFM HP and 0-80586 DOMINATOR alcohol carburetors featured elsewhere in this catalog. 5 Hg Quantity. Subject: Holley 750: Reply: The vacuum advance port on a Holley is usually sticking out of the passenger side of front jet plate. 5-1 Forged pistons, Edelbrock performer RPM, rect heads. The carburetor identification number on the HP series are stamped into the linkage side of the main body. the 750 or possibly a seven hundred is the place you will be. The video explains the various jet sizes, and how. For example R-4776, or R-4776-1. About 325 HP i would guess. Recheck to assure all existing vacuum hoses are attached properly. I never use power valves on the secondary side, go up 6-7 jet sizes and all should be well, you might start with a #82 jet. Also realize that a bone stock Holley 80496 950 double pumper is only flowing a tad over 800 cfms in most applications. Jet size selection for the Autolite is more limited than with the Holley. These performance calibrated gasoline four barrel carbs are race ready, right out of the box. And lose the three inch duals for some 2 one million/4-one million/2 inch to velocity up exhaust velocity and help scavenge for extra backside end and MPGs. Carburetor Jet Tips. I have a 428 holley carb and in take,and a 429 supercobra jet intake,a complete 429 from a 72 car, and a 365 HP 460 in a 71 lincoln flywheels and bell housings 4 speed trans,bucket seats,8/9"rearends, and much more!! 300 parts cars so ask any questions!! phone or text 204 638 1035. Also it delivers results just a squeak shy of those produced by a Holley 950 Ultra HP, which in itself is an outstanding carb. it is not a complete list of all carbs made by holley over the years. Was wondering if anyone had already tried a PF HP Main Body with 750 DP parts. Finding the correct air and fuel mixture will help extend the life of your engine. The test was four Holley XP series carbs, 650, 750, 850 and 950 CFM. 351 4V Cleveland (351C) in a 1965 Mustang (Yes, that is right) with a lumpy roller cam and single plane Edelbrock intake with a Holley 4777-5 double pumper 650 carburetor. They utilize the best features from Holley's Race Bred 4150 HP carbs, but are tamed for street and light competition use. Jet extensions are supplied with these carburetors. 540" lift and 305/312 degree advertised duration, 253/260 degrees @. Is the 770 too much carb for the engine? 2. It specs out to around 420 H. 11 for the opening rate and lift characteristics. The main body uses a radiused air entry. Jets are broached. All carbs are completely rebuilt, including bushing of throttle shafts and are wet flow-tested. 6 on pump gas but loved timing. The Street HP features an aluminum contoured main body design taken from the race winning 4150 HP™ and has a tumble polished shiny finish and screw in air. to get what they need to make sales. With a holley, you may need to rejet it, replace the air bleeds, power valve to adjust the mixture to a leaner conditions. Three more runs resulted in an average of 409. Classic HP carburetors are available from 390 to 1000 CFM and feature a contoured venturii inlet for balanced air flow, screw in air bleeds for precision tuning capabilities, high flow metering blocks and Dominator style fuel bowls which allow pluming from either side for ease of installation. The carb is a tad lean yet and a jet change in the near future. All Holley’s lack the following features, standard on a Rochester Quadra jet: Metering rods for power enrichment, air door controlled secondary. 687 (1-11/16) Annular 150 70 82 70 33 Mechanical Secondary / Gas. Holley Street HP carb too rich at idle. list # cfm stock jetting power valve type 1850-2 600 (f)66,(r)plate 134-9 6. Turns out it was a 600. HP rating approximately 475 - 500 My carb is a Holley 850 double pumper, mech. 5-1 Forged pistons, Edelbrock performer RPM, rect heads. I've heard of people having tuning trouble with the Demons,and most advice on this board was to stay away ( based on an extensive search of this site ). Of course, the millionaires among you will scoff at this, so please ignore. Awesome response low mid range. I went down three sizes of main jet and up two sizes of idle circuit air corrector (as it came from Holley). After 1972, the CFM rating on all three models was raised to 800. About 325 HP i would guess. The 3310-1 Holley was a 4150, it used #76 jets and being a 4150 used a metering block. Here is a link to an Air Density Calculator. I have for sale a used Holley Carburetor removed from a running car several years ago. demon 750 cfm mighty demon carburetor 5402010gc mech secondary dual inlet The Mighty Demon™ is perhaps the best value for the dollar in the carburetor market today. The carburetor identification number on the HP series are stamped into the THROTTLE SIDE of the main body. The metering system includes a timed spark port for a vacuum advance distributor and is calibrated. , ported single plane intake. Give Holley tech a call at 866-464-6553. of 24 standard length jets that range in size from. They also give instructions on changing the jets for increased performance. They utilize the best features from Holley's Race Bred 4150 HP™ carbs, but are tamed for street and light competition use. The primary jet is a 70 and secondary is a 71. As you can see, these new Ultra HP Holley carbs are jammed with features every racer use. H25-73: H25-48: Double Pumper 800-850 Butterfly# 180 Pri. The new engine incorporated several changes, some obvious and some not. Only at www. "75" indicates 7. About 325 HP i would guess. To locate and identify your Holley carburetor the number is located stamped into the front of the choke tower and will either start with the letter R followed by 4 or 5 digits. So I donk it in my Torana. Engine is a 351: 10. When it comes to jet sizing, the number size of a jet does not correlate with the diameter. Is the 770 too much carb for the engine? 2. I just read your other post. Holley Carburetor Numerical Listings Carb. The main body uses a radiused air entry. of 24 standard length jets that range in size from. Carburetor rebuild kits, Bushing kits, Ethanol Compatible Accelerator Pumps, Jets, Rods, Floats, Gaskets, Needle & Seats and Rochester Quadrajet Carburetor Tech info. Image SKU / Part No Application Stock Price Add to Cart; HOL0-8082-1: Choose HP Dominator: 1050 CFM 4500 Four Barrel, 2 Circuit: 0: $933. Note: Jet hole sizes provided below are for reference only. AFR 195 heads, Performer RPM intake, Holley Street HP 750 mechanical secondaries pn 82751 4 corner idle, comp cam xr 288 roller cam. 325 kN/m2, 101. I think Holley has some 20 improvements over past. HOLLEY 750 vs HOLLEY 750HP - posted in Engine: Allright boys, got a question for you all I bought a dyno'd engine that was sporting a Holley 750. I have just purchased a 750 HP part number 0-80528-1 brand new. 5l Sport Jet Rebuild Kit - 100-21-215 -. So I donk it in my Torana. dur 288/294 lift 520/540. I now need opinions about 2 specific Holley carbs I'm looking at. Carb Chevy For Carburetor 4. 5 4160 1850-3 600 (f)66,(r)plate 134-9 6. Holley 134-300SA HP Main Body Retro-Fit Kit Aluminum 750 CFM NEW Holley 134-300SA HP - $164. The newer "HP" line of four barrel carbs have the "List #" on the driver's side of the throttle body. Number of Barrels 4 Primary Discharge Nozzle Size (in) 0. P75-67200 Description:Finally an affordable high performance race carburetor. Holley® 4150 HP ® carburetors have no choke tower. Note: Jet hole sizes provided below are for reference only. These jets will not fit the standard Holley metering block; they are designed to fit only the 750 and 950 CFM HP and 0-80586 DOMINATOR alcohol carburetors featured elsewhere in this catalog. Click the button below to add the Holley 750 Hp Series to your wish list. My Holley runs starts idles great. Also realize that a bone stock Holley 80496 950 double pumper is only flowing a tad over 800 cfms in most applications. 5 inches of mercury for its four-barrel carbs, while bumping this to. I'd change the idle feed (fuel) restriction first. An HP 950 Holley® is came from cutting two 4779 750 carburetors in half, and bolting the two secondary sides together and then installing and 850 baseplate. The difference between a Street HP and a reoular HP-series carb lands mostly in the factory tune-up ,and it. 5 to 1 Small Block Chevy (350 cubic inch) with a 302 duration 480 lift hydraulic cam (Fireball 2) pretty ported #186 casting number heads, 2. I'm just curious what size carb you guys are running on your 460's and at what RPM's? My set up is:. The nitrous jet chart is based on bottle pressure of 900-950 psi. Fits Alcohol 750Hp And 950Hp. Jet Size: Primary-73; Secondary-73 The important thing to mention here is that of all the carburetors tested, only the 750-cfm HP Holley came with a vacuum port below. Butterfly# 173 Sec. , ported single plane intake. 5 4150 3124 750 (f)70,(r)76 8. Jet size selection for the Autolite is more limited than with the Holley. Anybody know what the stock jet sizes are for a Holley 750 HP carb? I just picked one up, the jets in there are huge, 92's in the front and 88's in the back. OK, the carb size has been established. For example R-4776, or R-4776-1. The generally accepted range is a two- to three-percent change in flow per jet size. 0s @99mph with this carb. Is the 770 too much carb for the engine? 2. 050", 106 lsa cam, brodix IK200 heds, RPM intake, 3500 stall, 3. Each of the carburetors we tested was from Holley's HP line, and included a 650 Street HP, a 750 Street HP, a 950 Ultra HP, and a -1,000 HI). I have gone down to 75 and 82 rear. Barrels: 4 Booster: Down Leg Brand: Holley CFM: 750 Choke: None Circuit: 2 Emission Code: 3 Finish: Gold Dichromate Fuel: Gasoline Fuel Inlet: Dual Material: Zinc Model: 4150 Primary Main Jet: 73 Primary Power Valve: 6. Our Quick-Fuel Products are priced so low we can't advertise them under the terms of our "Minimum Advertised Pricing- MAP" Agreement. What we ultimately found was that Holley had this carburetor made its best power right at a 13:1 air/fuel ratio. 8 jet sizes up from the stock jetting on a 4-bbl generally, but it varies as Holley carbs are generic castings with custom variations for some versions. If you have a 4spd and 3. Note: Jet hole sizes provided below are for reference only. 100% Holley - Made in the USA. 1L 7043014 eingines L6 250 250 7043014 L6 eingines Carb GMC 7043017 & 292 Chevy 4. I have for sale a used Holley Carburetor removed from a running car several years ago. Differentiating a 750 cfm from an 800 cfm casting is easy to do by looking through the primary venturi barrels. Similarly, a change in the carb's inlet air temperature may require a change in the jet size from the stock calibration. 5 inches of mercury for its four-barrel carbs, while bumping this to. Free shipping. Part Type: Carburetor Model: Ultra XP Series Application: Competition Fuel Type: Gasoline Number of Barrels: 4 CFM: 750 Choke Type: Manual Fuel Inlet: Dual Fuel Inlet Fitting Size: 8AN (o-ringed) Inlet Threads Secondary Type: Mechanical Secondary. I orgionaly bought it for a 3. Test Five: 950 CFM Holley HP Retest Based on this testing, the Holley HP 950 double pumper seemed to be the best overall carburetor for the 455. 5 p/v front & rear. 5-1 Forged pistons, Edelbrock performer RPM, rect heads. All the features of Holley HP Series plus so much more. HOLLEY ULTRA HP 750CFM E85 CARBURETOR MECH SECONDARIES GREY/BLACK HO0-80843HB These Holley aluminum Ultra HP carburetors feature all-new construction for maximum performance, right out of the box. Contained In Plastic Case. Goes great ! But I have this cool brand new Holley 750HP sitting in my garage off my old motor, AND I dont want to. Remove the jets and insert a smaller/larger set based on the vehicles operating altitude. I have just purchased a 750 HP part number 0-80528-1 brand new. Here is a variety of accelerator pump cams. Jet kits provide a selection of jet sizes to make it easy to add/reduce the amount of fuel/air mixture. Condition is New. One column for fuel jet size with the fuel pump that comes in the kits and the other column for hi-output pumps - like the Holley Blue with 5-7 psi flowing pressure. The arrival of the 1968 Corvette occurred at a time when the world, much like the Corvette itself. The Street HP features the contoured main body from the 4150 HP™ and has a tumble polished shiny finish and screw in air bleeds for precision tuning capabilities. 606 b42/55 n208. Jet Size: Primary-73; Secondary-73 The important thing to mention here is that of all the carburetors tested, only the 750-cfm HP Holley came with a vacuum port below the base of the carburetor. (I am at 4,000 feet) I finally decided to go to bigger jets to see what would happen, two jet sizes seemed to help, but not much, 4 jet sizes did something, 6 even better. This motor is a brute for a street car and would only be considered a weekend blaster. The main metering restrictions, in the end carb metering plates, are. i have remedied that and i figured while i had it all apart i would check the transfer slots on my carb. Original equipment for 1966 Chevelle 396 Special High Performance. All the features of Holley HP Series plus so much more. 6 on pump gas but loved timing. The Street HP features an aluminum contoured main body design taken. They utilize the best features from Holley's Race Bred 4150 HP™ carbs, but are tamed for street and light competition use. For tuning purposes on the Ultra HP 850, we leaned the carburetor out by four jet sizes to achieve a 13:1 air fuel ratio, where it made the most power. "You should sell the. Not everybody needs or can afford a pair of split Dominator carburetors for their car to make big power. Plug 5 and 6 on their way to beeing the same when cruising. My edelbrock gave me 12 mile per gallon. Part Type: Carburetor Model: Ultra XP Series Application: Competition Fuel Type: Gasoline Number of Barrels: 4 CFM: 750 Choke Type: Manual Fuel Inlet: Dual Fuel Inlet Fitting Size: 8AN (o-ringed_ Inlet Threads Secondary Type: Mechanical Secondary. I removed a 750 Holley that had major issues and bought what I thought was a 750 edelbrock used. Running a 750 dp holley. These carburetors are tamed for street and light competition use. You don't take the venturi of a 750 (1 3/8th) and mate it to the throttle bore of an 850 (1 3/4) and get it to flow 950 cfms. of 24 standard length jets that range in size from. If you have a 4spd and 3. Carb comes ready to run. Primary jets i put in are stock holley jetting followed by 10 higher on rear. the proper way to jet up after removal of the power valve is to measure the area of the power valve channel restriction, add this the the jet area being run, and. of 24 standard length jets that range in size from. These jets will not fit the standard Holley metering block; they are designed to fit only the 750 and 950 CFM HP and 0-80586 DOMINATOR alcohol carburetors featured elsewhere in this catalog. Specifically built by Holley for the Australian Market, this 470 CFM carb has the same main body as an 0-1848, but with a range of additional features including: a manual choke, side-hung bowls with single banjo inlet for easy hookup, secondary block to allow easy jet changes, quick-change vac secondaries and vac ports on the base for PCV/distributor hookup. About 325 HP i would guess. Automotive Stuff is your source for Holley Fuel Systems, Engine Components, Air Intake Systems, Ignition Systems & other Holley parts and accessories. Comp Cams 305AH-8 camshaft with. Visit our site for coupons and promotions. Current setup is a 468, hydrolic roller, 10. All the features of Holley HP Series plus so much more. They utilize the best features from Holley's Race Bred 4150 HP™ carbs, but are tamed for street and light competit. 190" CNC throttle bores, venturi sizes to 1. com and check the specs, you'll be surprised this is true. This has the factory Holley calibration and jetting. 1L Carburetor For 4. The HP series carbs that use HP series metering blocks that were purpose-built for alcohol use are using 5/16" alcohol jets that are much larger in size and in numbering than the standard Holley jets, and they do not require aux holes to be drilled in the blocks. Metering-Plate-to-Main-Jet Correlation Chart The chart below can be used as a guide when correlating main metering jet part numbers to secondary metering plates. The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. What we ultimately found was that Holley had this carburetor made its best power right at a 13:1 air/fuel ratio. Note: Jet hole sizes provided below are for reference only. 520 cam Usually the best jet sizes for a Holley carb are the. 5 inches of mercury for its four-barrel carbs, while bumping this to. If it helps, increase the jet sizes again to see if it helps even more. I now need opinions about 2 specific Holley carbs I'm looking at. If it helps, increase the jet sizes again to see if it helps even more. The first is a 4160, 750 cfm, model # 0-3310S, vacuum sec. To find the exact value, click on the link below and print out the page that opens, or hold a ruler against your screen to connect your minimum full-throttle RPM with your engine size, and extend the line to the carbie size. As I recall, a 750 vac/sec with manual choke is jetted for a stock 390/396. HP rating approximately 475 - 500 My carb is a Holley 850 double pumper, mech. HP™ Classic Race Carburetor; 4 bbl; 750 cfm; 2 Circuit Metering; Model 4150 HP; Vacuum Secondary; Dual Fuel Inlet; Gas; Single 30cc Accelerator Pump; Gold Dichromate Finish; - 8. I don't want to get into an Edelbrock/Carter vs Holley war here, they're all good carbs and I would not hesitate to use any of them - and have done so as well as I still own all three brands. holley has also been doing away with the power valve all together. 98 would like it down around. Holley understands this and has created the Brawler line of carburetors for those who are looking for a unit that can make big power, without taking a huge bite out of their bank account. The center carb jets are two jet sizes smaller for the small blocks (up to 375 inches) – #62 jet, and #64 jet for the 440 big blocks – yellow springs for the end carbs in both cases. 750 (1-3/4) Down Leg 160 76 84 70 33 Mechanical Secondary / Gas CQ-950 1. 4 Each Of Jet Sizes 132-200. 032 4776 (-1 -2) 600cfm Primary Main Jets 66. I put on a 750 Holley to get it on the lake. On your engine, let's say someone (not you, of course) has messed with the carburetor and it now has 75 primary jet and an 85 power valve (71. 5 Primary Pump Nozzle Size: 31 Product Type: 4150 Model Carburetor Secondaries: Mechanical Secodary Main Jet: 73 Secondary Power Valve: 6. Holley 3310 tricked rear block. This is different from a Holley: A Holley has a given main jet size which meters fuel throughout the rpm range, including cruise. My experience, though, is that the "optimal" setting should be fairly close to factory jetting, IF the carb is appropriate for the engine. Idle was a smooth 780 rpm. The JET Holley Stage 4 HP Series Carburetor is a universal carburetor. Holley -80535-1K - 750 cfm 4150 HP Carburetor Kit Includes 750 CFM Carb - 30cc Accelerator Pumps $846. Engine is a 401 that has 450+ hp @6500rpm. Carburetor rebuild kits, Bushing kits, Ethanol Compatible Accelerator Pumps, Jets, Rods, Floats, Gaskets, Needle & Seats and Rochester Quadrajet Carburetor Tech info. I can get either the Holley 750 HP 0-80528-1 or the Holley 750 HP 0-80529-1 for ~$600 from a local shop. Screwdriver is supplied for idle bypass adjustment. Size Prim Jet Sec Jet Idle Bleed Inter. Hi I did some searching on this site and not sure what the general feeling is on the Proform Main body. Similarly, a change in the carb's inlet air temperature may require a change in the jet size from the stock calibration. USA made carburetor parts for Automotive & Marine Rochester Quadrajet 4 barrel carburetors. Number of Barrels 4 Primary Discharge Nozzle Size (in) 0. , 11" idle, cruise 15". It had its jets played with, timing adjusted etc etc, to get it at the absolute peak of its performance. This will, provide you a baseline as to how your carb started out. I am getting ready to put my motor in my 19' jet boat, the motor is a 396 with a decent cam ( on the higher scale of "mild" but not radical) the motor is balanced and according to the machine shop will make 500 hp no problem, I think realistically 400 -450 hp, I had a circle track BLP 800 holly that I had a carb shop rebuild with marine components, I ended up selling it because I really just. They utilize the best features from Holley's Race Bred 4150 HP carbs, but are tamed for street and light competition use. On a typical Holley, we would normally make jet changes in two stop increments. Jet size selection for the Autolite is more limited than with the Holley. The car ran 11. I put on a Holley 650 dbl pumper on my 351w and it has a lot of black smoke coming out the exhaust and smells rich. Most square flange Holley carbs have the "List #" stamped on the front, driver's side of the choke horn. Three more runs resulted in an average of 409. FBO/Quick Fuel Carburetor Size and Series Chart. I have a 650 Holley, the 650 was a low mileage carb that was run on a drag car, it has the nozzle type squirters and had larger jets in it. Carburetor Throttle Blades - Carburetor Parts & Kits for Rochester, Carter, Holley, Edelbrock, Ford Motorcraft QJet, 4G, 2G, Mercarb Marine, AFB, AVS Thermo-Quad Carburetors JavaScript seems to be disabled in your browser. The largest venturi size listed (other than dominator) is for the 850. 11 for the opening rate and lift characteristics. Holley 0-4779C Model 4150 Double Pumper 750 CFM Square Bore 4-Barrel Mechanical Secondary Manual Choke New Carburetor in Carburetors. Holley has been the undisputed leader in fuel systems for over 100 years. And while you are giving analogies: low HP 409 used Rochester 4-jet, medium HP 409 a Carter AFB, and the high HP 409 used 2 Carter AFB's. 5 pv weakest spring C8ve heads mildly ported stock valves. Holley Standard Main Jet Chart: I asked Holley Technical Dept. Re: 950 HP jet size for street in summer air and especially street driving i can't see why the stock 78 square jetting wouldnt work for you btw,your power valve size should be 50% of the vacuum at idle reading. it is not a complete list of all carbs made by holley over the years. The question that I have can anyone give me any and all information on the air bleeds. 5 Hg Quantity. The carburetor identification number on the HP series are stamped into the linkage side of the main body. You really almost don't need to touch anything. Free shipping. HOLLEY ULTRA HP 750CFM E85 CARBURETOR MECH SECONDARIES GREY/BLACK HO0-80843HB These Holley aluminum Ultra HP carburetors feature all-new construction for maximum performance, right out of the box. Buy Ame rican !!!! #10 Brucer , May 15, 2008. As you can see, these new Ultra HP Holley carbs are jammed with features every racer use. The idea is to convert currently-used Holley jet numbers to a "standard" environment, so that one can perform future calculations to other environments. 3 to 1 compression, Air Gap RPM intake and RPM heads with 2. Is the 770 too much carb for the engine? 2. Screw both of the screws in until they gently bottom out, and turn them both out 1-1/4 turns. Carburetor Throttle Blades - Carburetor Parts & Kits for Rochester, Carter, Holley, Edelbrock, Ford Motorcraft QJet, 4G, 2G, Mercarb Marine, AFB, AVS Thermo-Quad Carburetors JavaScript seems to be disabled in your browser. FORD and MUSTANG Holley 4150 Carburetors C3AE-B list 2668 427, C3AF-BE list 3255 65 Ford Full Size 427, C3AF-BV list 3255-1 66 - 67 Ford Full Size 427, C5AF-BV list 3255-1 66 - 67 Fairlane 427, C6OE-N list 3557 66 Fairlane / Comet 390, C6OE-M list 3530 66 Fairlane / Comet 390, C7OF-A list 3793 67 Mustang 390, C7OF-B list 3794 67 Mustang 390, C7OF-C list 3795 67 Mustang 390, C7OF-D list 3796 67. The largest venturi size listed (other than dominator) is for the 850. 103 vm28/486 vm28-213 424-22. USA made carburetor parts for Automotive & Marine Rochester Quadrajet 4 barrel carburetors. I went down three sizes of main jet and up two sizes of idle circuit air corrector (as it came from Holley). These jets will not fit the standard Holley metering block; they are designed to fit only the 750 and 950 CFM HP and 0-80586 DOMINATOR alcohol carburetors featured elsewhere in this catalog. Edelbrock is the most respected name in performance! Since 1938, Edelbrock has manufactured its core products in the USA for quality and performance. Don't be surprised if you need to go up to. Primary jets i put in are stock holley jetting followed by 10 higher on rear. As a result, jets should never be re-drilled, nor should they be strung on a piece of wire for storage. Comes small parts bag, 2- Needel & Seats,2- 50cc gas diaphrams and all the none sticks gaskets for gas carb. 7 L/350 CID 6. 0s @99mph with this carb. 5 inches of mercury for its four-barrel carbs, while bumping this to. 4776 600cfm Primary main jets 69 Secondary main jets 71 Power Valve 6. , 11" idle, cruise 15". 45 14 degress initial timing Muncie M-21 transmission Rear Axle ratio - 3. 4 Each PN[122-132 Thru 122-200] Carburetor Jet from Team C Performance Center the best source for Holley Performance Alcohol Jet Kit 36-201 for your auto or truck. 5 4160 2818-1 600 (f)65,(r. Powering the biggest names in NASCAR to the Saturday night racer, HP carburetors are the perfect choice for all types of motorsports. The RPM entered should be the maximum RPM the engine is to run (you know that RED LINE on your tachometer). They look allot like a double pumper but thy have vacuum secondaries. I'd like to compare. 687 (1-11/16) Down Leg 160 74 82 73 36 Mechanical Secondary / Gas RQ-750-AN 1. The HP series carbs that use HP series metering blocks that were purpose-built for alcohol use are using 5/16" alcohol jets that are much larger in size and in numbering than the standard Holley jets, and they do not require aux holes to be drilled in the blocks. If your 4M, 4MC, or 4MV Quadrajet was built before 1972, it is a 750 cfm carburetor. Holley Performance 0-82751 Street HP Carburetor 750cfm Mech Sec Double Pumper. sorry for my lack of activity, my engine developed a light knock. The carburetor identification number on the HP series are stamped into the linkage side of the main body. Barrels: 4 Booster: Down Leg Brand: Holley CFM: 750 Choke: None Emission Code: 3 Finish: Shiny Fuel: Gasoline High Speed Air Bleed: 36 Idle Air Bleed Size: 71 Material: Aluminum Model: 4150 Primary Main Jet: 77 Primary Power Valve: 4. Holley® 4150 HP ® carburetors have no choke tower. Most square flange Holley carbs have the "List #" stamped on the front, driver's side of the choke horn. Holley 750 double pumper jet size. 5 4160 2818-1 600 (f)65,(r)76 6. These performance calibrated gasoline four barrel carbs are race ready, right out of the box. About 325 HP i would guess. Holley understands this and has created the Brawler line of carburetors for those who are looking for a unit that can make big power, without taking a huge bite out of their bank account. 400 Venturi 1 11/16 throttle plate. To check for this lay the metering. Big Or Even Bigger - 750 Vs. For tuning purposes on the Ultra HP 850, we leaned the carburetor out by four jet sizes to achieve a 13:1 air fuel ratio, where it made the most power. 1 x Genuine Dellorto DHLA/DRLA Main Jet Size 148 more sizes available. I put the 4150 HP 750 cfm mech sec double pumper on mine. that size a carb. 3 to 1 compression, Air Gap RPM intake and RPM heads with 2. Holley Street HP carb too rich at idle. The Street HP features an aluminum contoured main body design taken. The 3310-1 Holley was a 4150, it used #76 jets and being a 4150 used a metering block. Fits All Holley Model 2010, 2300, 4010, 4011, 4150, 4160 & 4500; Sizes from 40-110; 1/4-32 Thread. Thanks for the help. 650 holley dp with holley 750 metering blocks problems The 750 would comes with jets 3-4 jet sizes larger. The question that I have can anyone give me any and all information on the air bleeds. of 24 standard length jets that range in size from. The JET Holley Stage 4 HP Series Carburetor is a universal carburetor. Street carbs and performance carbs of the same cfm rating will be jetted differently, too, so you can't always use the jet rating for different. I have just purchased a 750 HP part number 0-80528-1 brand new. The carburetor identification number on the HP series are stamped into the linkage side of the main body. HP carburetors include premium features that allow them to perform like more expensive "modified" units. Since we had misgivings about the true streetability of a double pumper, we had fitted a Holley Avenger 830 CFM vacuum-secondary for street use, where it worked OK. Each of the carburetors we tested was from Holley's HP line, and included a 650 Street HP, a 750 Street HP, a 950 Ultra HP, and a -1,000 HI). Mad Jack's appropriate. Holley ran a comparison on 4carbs on a stock 69Chevelle w/325HP 396 (L-35) w/10. 5 inches of mercury for its four-barrel carbs, while bumping this to. Holley Performance 0-82751 Street HP Carburetor 750cfm Mech Sec Double Pumper. Engine is a 351: 10. dur 288/294 lift 520/540. At WOT, the power valve unseats, and opens a fixed orifice, dumping a fixed amount of fuel in addition to the main jet. Kit Kit Needle Jet or Plate Block Block Power Valve Nozzle & Seat Size 0-1848-1 4160 465 37-119 37-933 6-506 122-57 N/S N/S 34R9716-3 125-85. You can jet the 750 down and make it "work" but in a PU your throttle response is going to suck. com and check the specs, you'll be surprised this is true. Most holleys are to rich. If you have a 4spd and 3. i have a holley 750 on a crate 350 motor i beleive its 290 hp it has size 70 jets in it and it runs to rich i turned the air fuel screw all the way in and the motor did not idle down or try to stall i am looking to find out what jets i should use thanks. the secondary transfer slots were totally covered up on the secondary throttle plates. Many dirt bike owners go the OEM route for new jet kits however aftermarket jet kits often work just as well if not better.
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