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Holley 750 hp stock jetting. 5 PV in front only and 31/28 squiters.
Holley 750 hp stock jetting. Stock jetting is 72 primary, 75 secondary. Holley jets are number-stamped on their side for identification purposes. What jets would you guys run and why? Jul 12, 2016 · Tuning a Holley 4150 750 cfm ultra dp for a 318 Jump to Latest 12K views 36 replies 8 participants last post by 36 sedan Jul 14, 2016 Rusticcreationsme Discussion starter The Holley Jet Size Guide is essential for optimizing carburetor performance. The first one is a street AED base model and the newest one is there HP HO version with the HP main body, flowed with screw in air bleeds. Holley carburetors have a power enrichment system that provides fuel to the main power circuit during heavy loads or under full throttle situations. 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. 037 inch, and the idle-air bleeds will Oct 31, 2004 · Holley makes lots of variations in the 4150 DP carbs so you need the List number. I had a holley 650 DP (4777-2) carb with 72 primary, 76 secondary jets, NO power valve. It has 70 front jets and 80 rear jets (the Discussion on jet sizing differences between primary and secondary jets in carburetors for automotive enthusiasts. An 850 cfm "double pumper" turns out to be a 650 cfm with vacuum secondaries. comp 08-432-8 roller cam vortec heads 9. I am using the carb as it came out of the box and am assuming that the primary Mar 22, 2002 · But its not a stock carb. Carburetors are calibrated at 70° at sea level. In an effort to help our Feb 21, 2025 · If you're tuning a Holley 4150 Series carburetor, getting the right secondary jet size is essential for optimal performance, throttle response, and fuel efficiency. We feel you have purchased the finest street performance carburetor currently on the market. It's running rich. Stock jetting is 70-80. according to holley it requires 75p and 76s jets with a 8. INTRODUCTION: CONGRATULATIONS on your purchase of the Street HPTM Carburetor! We feel that you have purchased the finest street performance carburetor manufactured today. 0 comp, 2800 stall, Accel HEI. intake, street strip car_ need input for primary and secondary jet sizes, am using power valve on primary Aug 29, 2005 · A good jet size for a holley 750 on a stock 390 Jump to Latest 12K views 5 replies 4 participants last post by junkyardjeff Aug 30, 2005 J Dec 23, 2012 · I'm blocking off the power valves on my 3310-2 holley carbs for my blower set up. Jul 14, 2017 · For many, carburetor jetting and horsepower seem inexplicably linked. It helps determine the correct jet sizes for specific engines, ensuring proper fuel flow and air-fuel ratios. Aug 31, 2011 · Mine has a secondary metering plate and I am currently using 70's in the front and 80's in the rear, which is what Holley put in them when new. The factory jet size is 72 on the primary. The vacuum operated power enrichment system is controlled by a Power Valve that times the operation to your engine's specific needs. I have a holley 800 double pumper Sep 30, 2019 · Way too leanstock jetting in 750 Holley's ranges from 72 front/76 rear for models with a rear power valve, and 72 front/80 rear for models with no rear power valve. May 28, 2009 · It is a roughly 10:1 427 with an Ultradyne 276/284 cam installed 6 degrees advanced, heavily massaged 049 heads with 2. Oct 1, 2010 · whats a good starting point for a mild build 460, build specs below ! i have tried the stock jetting of 72-80 and it felt way lean, but i have been up to 80-90 and have 76-84 in it right now and it just doesn't feel right when the 4bbl comes in, like it needs more fuel. secondary's, list #4160, part #80508s. 8:1 compression, stock cam, etc. A few Dec 2, 2009 · Holley explains how the main jets on a four-barrel carburetor operate. A few questions,. Have you tried rejetting and adjusting it yet. Aug 29, 2005 · Holley 750 Jets - Help Please Discussion in ' The Hokey Ass Message Board ' started by Heckler, Aug 29, 2005. Aug 9, 2013 · That's jetting, power valves, air bleeds, float height, anything that has been changed. NOTE: Jump two sizes when changing the carburetor jetting. 42 gears. 2. 5 power valve? I Apr 13, 2016 · Get the Best Performance with Holley 0-82750SA Aluminum Street HP Carburetor 750 CFM 0-82750SA parts at JEGS. My buddy bolted a 750 on a stock 302 F**D in a boat--picked up 7 mph and got better mileage than the tiny Autolite carb that was on it. 578. A vacuum secondary would probably be a better setup. Jetting may be necessary with the Demon, but the 351 CJ still had a few goodies left even in '73, my notes show the Cleveland Sep 10, 2017 · Engine Mods - jetting a holley 750 dp for a 454 - Hello, we have built a 454 for a Glastron CV23 jetboat , with LS 6 pistons # 3963550 ported peanut port heads, stock valves a stage 2 camshaft ENGESH 1139R CMI longtube headers, dual plane intake manifold comp cams roller rockers I just bought a Holley 750 Double Dec 25, 2006 · I know a 750 Holley will be too big for my 350 engine since I dont wind it past 6k but my Edelbrock is leaking and I would rather go to a Holley and I found a great deal on a slightly used Holley 750. 2 days ago · Calculate Jet Size Changes for Different Conditions Back to Calculators Index These equations are for recreation only. May 31, 2021 · The 750 Proform body will definitely not improve either a 4780 or a 4781. What I will have now: edelbrock dual plane c-396, 820 heads, pocket ported 2. To remedy this situation, Holley now offers the HP main body as a separate, bolt-in conversion. 3:1, headers. The car has always seem to run ok but have always thought that there is room for improvement. Comes in our authentic BRIGHT ZINC finish, or Classic Gold. 574/0. 542 112/108 Sep 23, 2002 · What is the List number off of the front of your Holley (it should be something similar to R4779 up to a R4779-6)? My Holley book shows 7 versions of the 750 DP carbmost with different jetting. We all have our opinions, but the only way I would use one of those is if somebody had a carb with busted boosters and already had the Proform body and didn't want to spend the money to put new boosters in their existing Holley body. AIR BLEEDS Air Bleed Specifications4150 HP and 4500 DOMINATOR HP Dec 3, 2018 · For example, the 0-3310-5 4160 750 carburetor comes stock with a PN 134-21 secondary metering plate that is equivalent to a 75 jet that is included in the kit. What changes should I make to the carb Dec 17, 2020 · How to ensure your Holley carburetor is using the right power valve for your engine. I decided to try the jets that came in it -- 72 Oct 14, 2004 · i have an old rebuilt holley 750 dp # 4779. If your Holley carburetor is equipped with four idle mixture screws, the procedure will be exactly the same except that the additional two screws will receive the same attention. 8 rear,adj uppers Oct 1, 2005 · I have a 4700 series Holley 750 DP, mech secondaries. Jan 13, 2020 · Re: 4150 4778 Holley carb questions by 1980RS » Mon Jan 13, 2020 10:35 pm Figure the 4778 700 like the 750 Dominator the difference is the bell shape boosters, easy to change on a Dominator but not on a 4150. I decided to put an HP upgrade kit on it -- the 134-300C holley part # (which should make it basically a 750 HP). I know this carb is too large for this engine, but it's what I have and I need to continue using it. You may have to tune the vacuum module with different springs, but that's not that hard Feb 27, 2012 · Here is the jetting from my old '86 Merc 420s with 188 or 088 GM square port heads, dual plane Weiand Stealth intake, Stainless Marine exhaust and old Barry Grant (Holley) 750's The butterfly's have 172 stamped on them, Front PV is 6-5, blocked in the rear, 30cc accel. Jul 27, 2015 · I went down three sizes of main jet and up two sizes of idle circuit air corrector (as it came from Holley). Might be a bit much carb for my application, but close for what it will be shortly. also if spacer would be recomended. Sep 16, 2006 · Another thing, the jetting should not need to deviate far from the original factory specs of the carb. Stock jetting is #72 primary jets power valve fuel holes (pvcr) they are Aug 16, 2009 · That means by purchasing a 750-cfm Holley HP main body, you can upgrade a 600 or 650 double-pumper to a 750 for less than $150. Runs rich as hell on the q-jet engine is a 454 with stock milled heads, edelbrock Performer intake, Rochester q-jet, 2 1/8 hedman headers, cam dynamics Alcohol jets: Holley alcohol jets are required with the following HP carburetors: 0-80498-1 950 CFM and 0-80535-1 750 CFM. Did you find that the Holley recommendation of 1 jet size (decrease) per 2000' held pretty Jul 12, 2009 · Well for years my DP 750 holley what i thought was a 4779 turns out to be 6109 tunnel ram carb after Rickster looked up numbers in holley book! (thanks Rick) I was running 76 primary and 84 sec. Holley is home to the top automotive performance brands including Flowmaster exhaust, MSD Ignition, Holley EFI, Hurst Shifters, Accel plug wires, Hooker Headers and many more. Holley Carburetor Numerical Listing May 23, 2015 · It is a street car which I take to drag strip twice a year, the Holley HP carb came with 75 & 76 Jets and now has 75 & 71, AFR was 8-9:1 at WOT and coming down 5 jet sizes has really woke it up. 88 valves, deshrouded,milled . Apr 8, 2001 · My notes show a Motorcraft 4V carb to be original equipment on the '72-'73 351 Cobra Jet. So I fired the car up this week and it seems to run INSANELY rich, black smoke everywhere. You can perform a cursory check to determine the existence of two potential issues: idle jetting size and the transition slot usage. So I took the bowls and the Jetted metering back block off of the 750 and built a manual choke version using my 600 Throttle body. Start with 70 to 71 in front and 78 to 80 in the rear and go from there with your vacuum gauge and tune from there. 5:1 comp) that has a weiand aluminum intake, hooker comp headers, and a Holley 750 DP that I put on it; per advice from a friend. To calculate the proper jet size for your vehicle, you'll need to know your elevation and outside temperature. My motor is a mild 383 with a Torker 383 intake and stock hp cam. NOTE: Reassemble carburetor to stock form, so fine tuning efforts can be analyzed with respect to the original calibration. Should you need information or parts assistance, please contact our Technical Service Department at 1-866-464-6553. We measured all the restrictions and jets in this carburetor as shipped from Holley and have listed them in an accompanying chart. 5:1 CR, Team G intake, 950 HP carb, heads are ported. Does work very well. Dont know how the carb is setup right now but what's the best jetting, power valve, and accelerator pump for a stock 429 street daily driver? Thanks Jul 12, 2009 · Well for years my DP 750 holley what i thought was a 4779 turns out to be 6109 tunnel ram carb after Rickster looked up numbers in holley book! (thanks Rick) I was running 76 primary and 84 sec. Lengthy video on tuning the jets on your holley carb. Oct 30, 2013 · C3 Tech/Performance - 750 Holley jetting - what do I need to know about the carb and engine to properly jet my carburator? May 8, 2016 · Building a 350 Chevy with a 268H Comp Cam, Vortec Heads, Headers, High rise manifold, 10. Turbo 700r4 with 3000 stall converter and a 4. He jets up a 750 cfm vac sec 4160 carb, with a 34-6 kit, and finds 72 mains, and 81 secondaires are it. Jul 29, 2009 · Hey Everyone, So I have a pretty much bone stock '72 360 (8. So my bud got it at a decent price. Based on how this engine runs, I want to rebuild. I'm currently running 72's on the primary and 78's in the secondary. 5:1,c8ve heads ported stock valves,Ford Racing a443 cam,Torker 2 intake port matched,Holley 3310 "tricked,holley blue fuel pump,3/8 fuel line from tank to carb,roller rockers,c6 rebuilt,2600 stall ,355 gears,hooker super comps,3" x pipe,26" drs,disc 8. Just get one of the Holley 750 HP bodies and swap everything over and have a really good carburetor. Oct 14, 2022 · As part of this story we will focus on the tuning required for a particular HP 750 cfm mechanical secondary Holley carburetor at altitude. The choke has been removed, but the choke horn is still there. Please have the part number and sales receipt ready when calling. Go to Edelbrocks site and read the owners manual pages. Aug 7, 2005 · Yes, given time, some money and a O2 sensor I am sure that carb can be dialed in. Jan 13, 2009 · recently purchased an hp main body to convert my 750 holley dp,the hp came with 72 and 84 jets as a starting baseline anybody know why the jet spread is so big 84 seems a little big?also the air bleeds are 75 for idle circuit bleeds which seem really big and high speed bleeds are 36. 0 Mustang, so he decides to use a 750 Holley 4-bbl, 4-bbl intake, and works it up to spin to 7800 rpm, and hopes to get 375 hp. Make sure float Oct 18, 2011 · I run a 750 Holley/Proform and with a 2. 19 1. Aug 3, 2009 · What are you guys running for jets in your 950 hp for street strip? I have 80's in the front and 89's in the rear with factory power valves front and rear May 14, 2007 · For a 502 cast iron head stock crate motor. 1. They also give instructions on changing the jets for increased performance. A PV accounts for 7-8 jet numbers. The 850 holley (4781-2) calls for 80 jets in front and rear with 6. 5 power valve front and rear. Holley HP™ carburetors have been the standard in racing carburetors for nearly two decades. Anyway I am tempted to go and The Street HP™ uses the best features from Holley's race Bred 4150 HP™ carbs, but tamed for street and light competition use. Specs listed below. Ran flawless until a carb issue surfaced the other day Mar 31, 2009 · Anyone know what the stock jets that come on 4779 holley 750 double pumper???Thanks mike Aug 7, 2013 · Hi guy I have a stock 1970 ford 429 with a performer intake and a holley 750 duel feed. I still may have to richen the secondaries. Large plenum manifolds will require larger jetting (3 to 4 numbers larger). Nov 17, 2012 · Due to varied applications that a universal performance carburetor will work with, a few tips on jetting are provided to help you understand their purpose. Aug 25, 2009 · Gentlemen, I need some starting point recommendations for Jetting the Big block. Barrels 4 Billet Color None Booster Straight Brand Holley CFM 750 Choke Electric Circuit 2 Emission Code 2 Finish Shiny Fuel Gasoline Fuel Inlet Dual Material Aluminum Model 4160 Primary Main Jet 72 Primary Power Valve 6. 5 PV. is on 383sbc , 9. These carburetors are built with unique metering blocks designed to accept the physically larger size of the alcohol main jet. 050" solid ft cam, open headers with 17" extensions, jegs 10" 2700 stall 4. . 5-9. Front 82 Rear 84 Air bleeds 72 Squirter 31 Power valves 3. Is it even Running an HP 850 on a somewhat stout 390. Carb came off a small block and has 64 primaries and 70 on the seconds. 468 Chevy, 9. And because of this, main jetting is often the cause of confusion in high performance carburetors. (12-433-8) I just put on a 750 CFM Holley double pumper. Cause a 750 hp holley runs power valve front and rear. Haven't touched the pump cam yet so it's at stock settings. Four corner idle adjustment and an adjustable secondary cam bracket makes it easy to dial in the idle quality. Have you tried calling Holley? Oct 15, 2013 · If you have a 454 Chevelle with the 450 hp engine or a home brewed version of this engine, it can be made to run considerably better by jetting out the stock Holley via . 030, heads cc'ed at 113, comp xe268, and headers should be a change in compression as well, be it a small one. Holley offers a variety of replacement and upgrade metering block and plates for your Holley Carburetor Jun 22, 2009 · A 750 VS or DP Holley can work just fine on a mild 350 if you know what you're doing--on a street car I prefer a VS. Carburetor has clear sight glasses so it easy to check the fuel level and threaded idle bleeds for on the car tuning. I will have trick flow heads, 10. What would be a good street/strip carb w/choke for this motor? I was thinking a 750 but I havent a clue as to the jet size? I can say the motor has a fairly big cam as it only has 7" of vacume at idle, probably need a 3. 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 Apr 9, 2013 · Power valve takes up for about 6 to 8 jet sizes fyi. What do you think? Jan 10, 2014 · I'm rebuilding a Holley 4160, List 3310-2 vacuum secondary carb that has been on my 75 jet boat for the last ~20 years. #82750SA A street HP base plate is used on the 650 and 750 cfm models so there are plenty of vacuum ports for power brakes, PCV, etc. Jul 19, 2010 · C3 Tech/Performance - Holley Jetting - Big block - What is the base jetting I should start with a BB that is making about 450-475 HP. Bought 750 Holley on a suggestion here. This has the factory Holley calibration and jetting. I would not recommend starting with that large a carb for a small block, but you already have it. Jun 1, 2025 · Understanding the Holley 750 Vacuum Secondary Carburetor Before diving into the tuning process, it’s essential to have a solid grasp of how the Holley 750 vacuum secondary operates. It's currently running way too lean. Holley manufactures each carburetor with a set of jets that will allow the carburetor to perform well at sea level and around 70 degree air temperature. Mar 17, 2006 · A typical Holley 750 double-pumper 4150-style carburetor is generally fitted with an idle-feed restrictor of 0. Spend a little time tuning, and a 750 is an excellent choice for a 350. I'm hoping I picked up a few hp with the carb upgrade. Mar 22, 2002 · C3 Tech/Performance - Jet size for Holley Carb 4150 - what size are you running? - I am rebuilding my carb right now and am getting ready to put it back together and was wondering what size jets you folks are running? Mar 8, 2023 · We will approach this story using a typical Holley four-barrel 750 cfm vacuum secondary carburetor with two idle mixture screws. The newer "HP" line of four barrel carbs have the "List #" on the driver's side of the throttle body. 750" throttle bores, how can the bigger ones be much if any better. This carburetor utilizes a mechanical design that allows it to adapt to varying engine demands, making it a versatile choice for a wide spectrum of vehicles. When I pulled the front bowl, I noticed the jets were different sizes, a 66 & a 69. Well needless to say it was way too much. My question is for those who've had experience tuning these or similar carbs for altitude. Tunnel ram manifolds (dual-quad applications) might require jets as much as five sizes larger than stock. Oct 8, 2020 · Re: Holley ultra xp 750 jet blueprint by superpursuit » Mon Oct 12, 2020 5:02 am mopardave wrote: ↑ Sat Oct 10, 2020 2:39 pm Thanks. 6 pump gas mtr. May 10, 2009 · My motor is a 396 chevy, 10. Mar 17, 2012 · Carburetion, Induction, Nitrous - 950HP Jetting - I have a 950HP and wondered how much I can jet this thing with out messing up the balance of the carb. Many folks buy a used carb at a swap meet or from an ad and find out that it wasn't what they thought they were buying. I don't have the hood on the car and therefore I'm Holley High Performance calibrationDescription Holley HP 750 CFM Carburetor in new light weight aluminum. The engine is a 350, mild Crane cam. Dec 7, 2020 · I always question the guys that just have to have a 950-1000 CFM carb. Cam is a 262/268 219/227 . From initial setup to fine-tuning, here’s how to get perfect throttle response and maximum horsepower Jet extension (Holley P/N 122-5000) can be used in conjunction with the secondary main jets to prevent the jets from being uncovered as fuel rushes to the back of the fuel bowl during extreme acceleration. The engine only demands as much as it can use. What jet size to 454 owners run with their cars? Or what would you recommend. Let’s put a 750 cfm Holley HP carburetor on this engine (PN 82751). This fine tuning resulted in the 700-hp mark being surpassed. If you need assistance, please call the Brawler Sales and Tech Support staff @ 270-781-9741, Monday through Friday 8AM – 5PM CST. Should you need information or parts assistance, please contact our HP Technical Service Department at 1-866-GOHOLLEY (1-866-464-6553). Heck, a 780 was put on the Z's 302 mills. Dec 4, 2020 · The larger plenum volume created by the spacer can require more fuel from the accelerator pump circuit. Here is the build specs of that carb off Holley site, likely pretty close at sea level but also a bit rich usually. . In this guide, we’ll Sep 20, 2007 · A buddy of mine bought a 750 Holley double pumper HP series list #82751 from a guy used but like new and the guy was pretty car dumb because he bought it for his stock 75 Monte Carlo 350. Plugs are "sooty" looking. I have tuned the carbs, set the jets 67/77 with a 6. 50cc accelerator pumps, I think not Jan 30, 2007 · I have a friend with a 67 SS 4 spd. 19/1. 073-inch jetting in the left front primary and . It will be more difficult than many of the holley carb guys are thinking. Having an issue with with the primary squirter. Oct 4, 2010 · 1991 lx coupe sleeper "in progress", 460 d9te short block 10. Currently have 86 jets, front and rear. The Holley is a stock replacement for the 425hp 396 and 427s. Different setup now however. Carburetor Air Bleeds and Jets are a must when track-tuning your carburetor for maximum performance! INTRODUCTION: CONGRATULATIONS on your purchase of the Aluminum Double PumperTM Carburetor! We feel that you have purchased the finest street performance carburetor manufactured today. The video explains the various jet sizes, and how they affect engine performance. 10 gear. I started off with a genuine HP holley main body(not proform) and used the baseplate, metering blocks, and bowls from the 650 DP I bought cheap last fall and put it all May 17, 2019 · I'm running two Holley 750 blower carbs, on a 671, with 5-6lbs of boost, on a fresh 355 sbc, Comp Nitrous HP . Well it got here and looks Apr 16, 2015 · Guys, hi hewb type questions here/my first BBC i recently purchased a 1970 Chevelle (SS clone) form the US Has 12bolt with 4. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across the finish line, the Double Pumper is a great choice whether you are burning up the May 6, 2017 · I personally have found thru the years of many drag racing test and tune sessions on holley carbs they have ran pretty darn close to stock jetting 1-2 numbers, now having said that, I always run the power valve blocked off on the rear and typically I'm good at 8 jets larger. The carb is a 3310-2 with the conversion secondary metering block. But I digress. you are already in dangerously lean jetting territory with the 10 sizes smaller #64 jet. Shop Now at the Guaranteed Lowest Price! Jul 27, 2015 · If this is the case the engine probably exhibits a stumble just prior to coming on to the booster-driven main jet circuit. I've tried varying them 1-2 sizes up and down both in front and rear but never really noticed much of a difference, not even at the track. 5 PV, and managed to get the blower surge out of He gets blown off by a 5. and a 396/375 HP motor. This is just a street cruiser. I assume they are using 2 pv's in the carb judging by the jetting. 25:1, LS6 cam. Start w/the stock jetting as a baseline and work from there. 1) I'm assuming you have the 3310 Holley 750? 2) Describe "ruuning poor" 3) Do you know what the stock jetting was? 4) Are the floats set at specs? 5) Is your PV matched to the Feb 13, 2025 · Holley List 6709 / 4150 Series, fits Stock Q-Jet Intake Manifolds 750 cfm Mechanical Secondary, Spread Bore Carburetor (Q-Jet Replacement) Date Code 3149 (314th Day, 1979) Double Pumper, Two-Corner Idle Electric Choke Reverse Idle Mixture Screw System Stock Specs: Front and Rear Power Valves: 6. 5 powervalve. 3000 stall, 391 rear end gears, headers, victer jr. I've done some minor tweaking to the carb in the past to make it run better, jets, power valve and squirters. (ie 0-4777-2) Those 6 carbs use 2 different primary jets and two secondary jets. Alcohol jets: Holley alcohol jets are required with the following HP carburetors: 0-80498-1 950 CFM and 0-80535-1 750 CFM. Mar 7, 2006 · For what it's worth on my 350 I tried a 600 Edelbrock, Holley 650 DP and spent time tuning each carb for my application after all was said & done I ended up with a 750 CFM stage 2 Jet Quadrajet on my 350. The engine dyno numbers in my sig were done with a 600cfm holley. - Currently, I'm running the factory Merc Q-Jet with Edelbrock parts and so it has been OK in terms of performance, however. 5 Primary Jet Size: 652 (Three number jets are more precise) Secondary Jet Size: 76 Primary If you are replacing an existing Holley carburetor, you may need to purchase and install a throttle lever extension (Holley P/N 20-7) on the carburetor. 14 SCR. Runs. Completely refurbished 4779 Holley has all new parts and non stick gaskets. Then set the initial timing at 18 and adjust the idle mixture screws with a vacuum gauge. It was running rich but that may have been due to other carb issues. Also, what timing do you run? I will buy a few jets around Sep 15, 2015 · Took sons car to the track and spent 7 passes jetting in the 850 holley double pumper, mid 12 second car, sbc 355, vortec heads, 247/255@ . Keep in mind that the stock jetting listed is for applications at sea level and at 70 degrees carb inlet air temperature and is meant to give you the baseline calibration. When i rang up hume performance on jetting on a 750 hp holley they said 72 front and rear. I would forget about DPs on the street. Mar 22, 2018 · C3 Tech/Performance - What Size Jets on 750 CFM - I have an LT-1 (1971) with a comp cam. Holley 750, vacuum secondarys. 750 Holley should never need more than 4 steps leaner or 6 steps richer jetting, unless it is a blow-through turbo or supercharged application. Mild cam, 8. 1 454, air gap intake, elderbrock oval port heads, 1 7/8" full length headers, roller rockers, and most important comp XE284H with 240/246 duration @ 0. 034 inch, an 850 will have a slightly larger 0. 18 degrees of initial timing 35 all in. 8 to 1 327 with vic. Its a 4777 650 cfm DP no rear power valve and 6. 5 PV and 37/31 squirters. The metering system includes a timed spark port for a vacuum advance distributor and is calibrated Aug 22, 2004 · whats your jetting on your holley 750 carb. Apr 2, 2010 · Just curious what the consensus is for jetting. The "as delivered" jetting from Holley is very close to optimum for the majority of high performance applications. Mar 28, 2009 · What size jets should be used on a stock 350, with a holley 750, headers, electronic ign, good flowing exhaust, 3. Jan 23, 2005 · Yeah will try that jetting but have never had it on a dyno. in 63 nova , 350 trans. 5 / 3. Stock Sizing was 470 cfm, however the carb may not be way too large for this engine to handle afterall for trial purposes. I jetted down from 71 to 69 and my secondaries don't completely bog out anymore but I need to get this thing dialed in 100%. Proper jetting enhances horsepower, efficiency, and overall engine performance. Running 10. Engine runs fantastic, however, stumble upon acceleration. Since the 850 and bigger Holley performance carbs all share the same 1. 5 Thanks, Dave One of the things we noticed over the years is the lack of information concerning Holley List #'s and the specifications for individual carbs and their stock jetting. One of my 600's 4150 Fuel Bowls (Square type) started leaking. Would really like to know what IFR, air bleeds and pvcr's. why is it that all the 4779-1 thru 4779-8 carbs run 70-71 primary and 80 secondary jets? is there an internal difference in the carbs that require that bid of a jet change? also on a mild street 454 how much of a difference would there possibly be between a hp 950 and the same Jul 22, 2008 · I have a Holley 750 double pumper carburetor (List #4779), that I have had very little problems tuning for both best WOT performance (by feel) and smooth cruisability (1800rpm-ish). eddy rpm intake. Aug 2, 2016 · Hey guys, quick question. I have a c6 with a stock stall and its in a 3600# wagon. Holley lists the stock specs for all of these systems and much more in the catalog. 530 /. 10 gears and slicks. Looks like a 3310 but a blend of the two carbs. 031" primary and . 11's and a Muncie m21. The cam and carb are new, Apr 30, 2014 · Hesitation when moving the throttle open is a accelerator pump adjustment change, pump cam change, or pump nozzle change, not a jet change. For example, the 650DP 0-4777 has 6 different configurations; One without a dash number, and -1 through -5. Jul 4, 2010 · carb. 080-inch for both secondaries (no mention of right front so I assume stock for a LS-6) And, ignition should be set up for 36-40 Sep 19, 2006 · Hey guys I just rebuilt my street carb for my 454 and wondered what the jetting should be for this carb on this motor. Oct 31, 2023 · Good evening all, I purchased and installed a Holley 750 street HP vacuum secondary. Jump to Latest 7. Just in the shop tipping in the throttle causes a stumble. A higher relative number indicates a larger jet size. This guide is tailored for Holley carburetors, including popular models like the 2300 and 4150, covering primary and secondary Jul 1, 2008 · The HP Ultra is an expensive carburetor, so Holley introduced a much more affordable Street HP 750 in the bright finish in either vacuum-secondary (PN 0-82750) or double-pumper (PN 0-82751 Jul 14, 2010 · Tuning with air bleeds is often easier than anything else on a carburetor. I ended up with 75/80 jest with 6. THe down side, as has been mentioned if it is a BG carb, that flow rating is a wet flow rating, and unlike the stock holley rateing, your basically looking at about 820cfm or so in dry air flow rating. Most modern race-style carburetors have screw-in air bleeds that can be exchanged externally with a simple hand tool. Powering the biggest names in NASCAR to the Saturday night racer, HP carburetors are the perfect choice for all types of motorsports. 5 Primary Pump Nozzle This page lists Holley carb specifications, stock jetting and tuning tips. The Aluminum Street HP takes all the great features from the race bred HP and the Double Pumper and combines them into the perfect street/strip carburetor. this info can translate to any holley 4150 and 4160 style carbs. jets on 9. 502 / . Idle Jetting Size One way to check on jet size is to use the 3,000-rpm test. The stock one came with 72/76 jets with 4. Brodix 200cc heads. i also bought the quick fuel metering blocks for this iam going to use the fuel bowls and baseplate off the I'm looking to do some fine tuning on my Holley 750 HP 80528-2 carb. Jul 12, 2010 · I'm going to be installing a Holley Street Avenger (81770) on the 468 in my Chevelle. Out of the box jetting is extremely close for most applications. pump, jets are: Front 77's and rear 87's. Recently I purchased a single sensor wideband to help with tuning in the May 2, 2004 · The stock jetting on a 750 vacuum secondary, like a 3310, is 72 and 78. Double Pumper carburetors are an American icon when it comes to performance carburetors. if you are off more than 3-4 jet sizes, I would go back to stock and re evaluate, especially with your set-up being quite docile and responsive. This is a mechanical secondary carburetor with accelerator pumps on both the primary and secondary sides- often referred to as a double pumper. It has #70 jets on the primary and #80 jets on the secondary. Mar 3, 2010 · What I had: stock 454 1976?? truck motor 236 heads stock intake cam manifolds, etc, heads cc'ed at 129 and a 750 holley. junior and 1 inch spacer and ported twisted old trickflow heads. accel pump components may be a different story, though. carb. Aug 29, 2005 · The 750 should be great for your donk if it's been warmed up. The carb was on a 454 so I know the jets are prob gonna be way too big so the question is what Sep 17, 2007 · Rated at a similar 750 cfm, these are highly coveted carburetors but also somewhat pricey. Otherwise I reckon one of the Holley, Rochester or Edelbrock spreadbore units would be just the ticket for driveabilty and economy. Rick came up with 75,76 stock jetting for this 6109 carb so i jetted 72,74 on this single vic intake and Blueprinted & hand assembled HP main body (smooth venturi, no choke) New style Holley fuel level sight windows Special high flow billet metering blocks & boosters All fuel circuits balanced & calibrated Power valve anti-backfire check valve kit Four corner idle circuitry for fuel control & tuning capability Special non-stick gaskets for easy Holley HP™ carburetors have been the standard in racing carburetors for nearly two decades. We would like to show you a description here but the site won’t allow us. That's their beauty. Remove the throttle stud and nut from the original carburetor. 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 Jul 29, 2002 · General Q & A - 383 w/Holley 750 need jetting tips. Your stumble is probably due to incorrect tuning of the accelerator pump and discharge nozzle. 88 valves and a Holley 3310 rated at 780cfm on a Chevy aluminum intake, (looks almost exactly like a Edelbrock Performer RPM with 1/2" shorter plenum). Carb is assembled with premium non stick gaskets to make it Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. When it comes to calibration, Holley carburetors are base line jetted at sea level at 70 degrees F. plugs look a little sooty Feb 1, 2003 · I will be installing a new Holley 750 vacuum secondary Model 3310, on my freshly rebuilt 355 which is in the works. Jan 15, 2006 · A vacuum secondary can work well on most anything. Mar 24, 2024 · Hi all, just a simple carb question to the Holley experts out there. 1K views 7 replies 7 participants last post by phel69 Aug 27, 2004 D May 28, 2013 · I have tuned two 750 Holley's over the past 12 years. Oct 14, 2011 · 10-15 HP can be done with proper bleed and emulsion tuning on any engine, but every engine has it's own needs. Holley 750 DP. Mar 14, 2013 · For a 440 with a spacer I would go larger on the jetting. crane 278 cam (222/222 467/467). So what Jetting should it have to work well? I do have a 600 that cam with it. 028" secondary. Changing to a larger or smaller jet will either richen or make leaner the carburetor’s fuel curve from part throttle to full throttle, respectively. This Jet Size Calculator will give you the size of the jet you need for a different weather condition. 8-1 compression on L31 block professional products cross-wind intake 1 5/8 semi-long Oct 20, 2010 · I am using a Holley 750 dual feed, vac. While Holley carburetors are known for their adjustability and user-friendly design, finding the ideal jet size requires a solid understanding of engine dynamics, air-fuel ratios, and driving conditions. It has . May 24, 2010 · On advice directly from Holley after I provided them my engine specs, I recently went to a Street Avenger 770cfm and my engine really liked the upgrade. Carb comes ready to run. Too many people have no idea how jetti Feb 26, 2025 · Optimize your Holley 4-barrel carburetor’s performance with these essential tips. Description Remanufactured 4bbl 750 cfm Holley 4bbl with mechanical secondaries, manual choke twin 30 cc pumps. This is in a jet boat. JETTING: Out of the box jetting will be extremely close for most single four-barrel applications. When in doubt, jet larger to start. Brawler would like to congratulate and thank you for purchasing this carburetor. Aug 2, 2018 · Holley Jetting Thanks for the info Bought it used and it is Vacuum Secondary with an Electric Choke. I don't see any real difference in what they can flow even with a larger venturies? Would that not just make the vacuum signal less? (Like a 1150 dominator compared to a 1050 dominator Nov 19, 2019 · A popular technique when addressing a carburetor related issue is to first return the carburetor to stock jetting, float level, and accelerator pump specs. 83 to 1 385 sbc with AFR 210 heads. Haven't tried to run it outside due to weather, does move one it's own around the shop. Sep 11, 2011 · The jetting of stock Holley DP 750 carbs vary, but almost all run low 70's up front, have a primary PV and 80 in the rear . In about 80 percent of cases, a carb calibrated by Holley needs only minor main jet recalibration. Mar 20, 2011 · For anybody curious about this upgradeI went ahead and did it today and figured Id give you my initial impression. 00. Feb 14, 2009 · ok, this is my first build, just rebuilt my holley and am wondering what would be a good initial jet setting for it for my build. 80 fronts & rears. You will have to know what the air density is for your current jetting that is correct for your tune. It is a modified vacuum secondary Holley that has staggered jetting (4 diff sizes),milled air horn, no choke etc. Carb came with a 76 in front and 80 rear, and a 6. It's harder to find it at the track, and engine or chassis dyno with O2 sensors can make it easier to tune any carb. Although you didn't specify what your engine is, on the assumption that it's a 350, I don't really see any problem with using a 750 vacuum secondary. Any ideas about what the correct jet size should be? Thanks Feb 18, 2005 · Hi all, I have a question about where I should start on jet sizes for my Holley 750? I'm getting ready to rebuild this double pump carb (mechanical secondaries) that came off of a SBC. If that were a 780 with mechanical secondaries it wouldn't have run nearly as well. Aug 12, 2019 · Elevation is also a large factor. 520 lift roller. is airhorn delete, choke delete, metering block kit on secondaries. Fine tuning my Holley HP double pumper carb (4150 with mechanical secondaries and secondary metering block) and I noticed the secondary metering block has a power valve shaped plug where a power valve would normally be if it were a primary metering block. 5 PV and 74F/82R jets, perfect set up for my 10. Apr 2, 2011 · I have never had to go less than 68 pri and 79 sec or richer than 75 87 (supercharged) on a stock or HP 750 Holley name brand holley carb. 5 front power valve. 5 PV in front only and 31/28 squiters. ybdlk zmzu fbj gsi rxyu cyio jdhafa ovkryg xyixntal ejyxm