850 holley jetting. Natasha Bashirian 01 May 2024 .

850 holley jetting jburns Discussion starter. Holley 750, vacuum secondarys. The "as delivered" jetting from Holley is very close to optimum for the majority of high performance applications. Just looking for input as may pick up a few I'll be replacing an original Holley List 2818 on a 1965 Corvette 327/365 engine. com 850 CFM HOLLEY DOUBLE PUMPER CARBURETOR 4781 - Allstate Carburetor Holley 650 double pumper | The H. Die I started messing with carbs in 1974, on a 340 dart 4-speed my first street/strip car. The Holley web site says to run a power valve 2" Hg below the lowest steady speed engine vacuum. They're also available in natural tumble-polished aluminum with Does anyone have any jetting numbers for a holley 850 DP> I have a 800 Demon on it that I dyoned with 73/83's. Ok so I finally got around to the Holley and when I looked it up it’s actually an 800 spreadbore not an 850. This seems like a lot of jet for a Holley 750 HP. The jets are contained in a plastic case that is designed to keep them separated and make them easily accessible. Hobbies › Car Engines & Parts. 47 posts · I've put smaller IFR's, larger IAB's, smaller main jets, and smaller main air bleeds in every Holley style carb I have. Qty. 5 71 6. Don't worry about "stock" jetting, except as a convenient starting baseline for tuning. On a 355 with single plane, pulls 6in vaccum in gear. 610/. 732 posts · Joined 2010 Add to quote; Only show this user #1 · Jul 12, 2010. The Holley 850 double pumper, List # 8162 is the predecessor to the Holley 850 double pumper, List # 4781 (which is the current list number for the 850 double pumper). This engine has been modified in that it has headers and ultra low restriction mufflers, increased compression ratio of measured/verified 11. 8 to 14. 5 mph on the transbrake leaving at 3000. The intake is a stock Eddy performer RPM with an 850 double pumper carb. Holley 650 DP 454 Jetting Suggestions. Your idle takes you to about 2500 rpm before the main jets really If available use the 850-cfm Holley #3955205 carb which is a special unit designed for the ZL-1 engine. The car now has a 79/91 jet combo. MC are you using a list#9380 Holley 850 DP carb. 5 This shows that To start with we were eye-burning rich out of the box. Obviously yours has had the PV removed in the secondaries. 075" diameter 120 pill size is usually about . Hi i have a 850 mighty demon carb on my 393ci cleveland, it is currently stock out of the box 850, 850 mighty demon jetting etc. Running a Holley 850 double pumper on a mild pump gas 454. If the venturis are the same size, 850 HP street used in good to fair condition Standard jetting and air bleeds Plus postage Location. I have a Holley 850 double pumper (choke horn milled off) on a 468 BBC. This was a conventional BBC with a dual plane intake and holley 850 model 4781. 06 Jun 2024 by Dr. C3 Tech/Performance - jet change question, Demon 850??? - The quick question is how do I do it? I have never changed jets before. The 750 should be great for your donk if it's been warmed up. Jump to Latest 15K views 18 replies 8 participants last post by fast 351 Oct 1, 2013. Those usually are set up for 4 corner idle, need to make sure base plate is drilled for idle circuit. The rest of the questions: How can you tell what size is already in there? Any recommendations on sizes? Where do I order them from? The problem is that I think it is running really rich. For example I have an 850 Demon with a 6. Holley pumper Holley 650 double pumper Holley 650 double pumper & holley 600cfm. As it turned out the jetting you suggested ended up being spot on for my car/conditions. port/closed chamber heads, with stock 2. Failure to follow these instructions, JETTING (MAIN JETS): application- 830 annular holley,850 demon,950 hp holley i always square jet to a point and always run a powervalve in the secondary side as well. i bought a 950 ultra hp off a guy. Otherwise I reckon one of the Holley, Rochester or Edelbrock spreadbore units would be just the ticket for driveabilty and economy. no choke,no pcv hookup. He is currently running a gas carb converted to alcohol. IFR's, IAB's, main jets, and holley 4 barrel carb list numbers and stock jetting. 5 power valves Post your Holley 950HP carb jetting. 9-13. Rob I pulled the 850 and bolted on a Holley 750 from one of my other cars. its the jetting and internal calibrations that are I ran an QF-SS-830 mechanical secondary and also a QF-Q-850-AN on a 450 ci (stroked 383). Holley 850 Ultra H/XP. Holley 850 Ultra HP tuning problems. CAM SPECS----INT EXH ADV DUR: When jetting a 850 holley 4 sizes down from its std. It was jetted and set up as it came from Holley. This is a brand new in the box holley carb. One of my buddys has been fighting with a 850 HP, it's the opposite- seems very lean. 030"-Stock 4" Crank-TRW Forged Pistons 10:1 Compression Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. 120" diameter It's up to you to know the correct diameter, though. F Stagger jetting Holley HP. Property Holley 850 hp street. 850 e85 jetting. I'm going to be installing a Holley Street Avenger Holley 650 Double Pumper Jetting. I have only tuned on 1 friends QF 950 and it followed along the same lines. Die holley 850 jetting. Jump to Latest 14K views 7 replies 5 participants last post by jmarkaudio Mar 15, 2013. What would be a good starting point for the jetting on the carb? It’s a 4781-8 850 Holley double pumper with mech sec. 87 at 150. 8 at WOT You will have to know what the air density is for your current jetting that is correct for your tune. So I put a 40 squirter on the back. 60s @ 115 with the dual plane manifold and weighs about 3700 with me. I have a 410 small block Mopar and I bought one of the Your jetting is in the 850-900 range. I have a 383 stroker running approx 490 hp. Anyway, I would estimate most low speed to highway speed vacuum steady state operations should be 14-19" Hg. That’s roughly a vacuum secondary clone of the original R-4781 850 double-pumper, which evolved from the vac. , etc. The pump cam adjustment kit is available under Holley P/N 20-12. Cobra with an 850-CFM carb and it's plenty for that displacement, which may imply that yours is too large. Carburetor, holley, Holley 650 Double Pumper Jetting. They're the perfect performance upgrade for stock to mildly modified vehicles and have that classic Holley look. What benefit (for a drag race car onlynothing to do with a street/strip car) does removing the primary power valve on a Holley and then jetting up the primary side of the carb. The jetting that i am currently using is: Primary: 76 Jets w/ 6. setting ,would that indicate the engine is wanting a smaller carb? Reply With Quote #11 09-05-2019, 03:47 PM Formulajones. 037 Problem is Is it originally an 850 Holley 4781 main body that has or had a choke? The jetting ended up to be 6 sizes different on the primary and 5 sizes different on the secondaries with the leaner side being the passenger side. Jetting, float adjustments, idle mixture screws, power valve, aint chnaged a thing. Preasumably, carb will 1966sbcduece wrote: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. Have reduced jet sizes down to 76 primary with power valve and 82 in the secondary no power valve. For That was a challenge in that AED claimed to have tuned it on the wet flow bench but it was way lean on any kind of acceleration like 15"s popping up on the A/F unit! After going back through it I ended up with the Holley HP metering blocks smaller main air bleeds but with same main jetting. I been doing much research and reading on jetting and tuning my holley. Dedicated to Building and Racing the Ford FE Engine. Believe it a #40 squirter up front with a hollow screw and # 35 out back ; but I can confirm. Dual feed fuel inlets assure you get all the fuel you need while its vacuum secondaries and electric choke make it Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. Seems anywhere from 78/86 to 82/90 will be in the ballpark. Save Share FOR HOLLEY PERFORMANCE CARBURETORS 199R7849-2 NOTE: These instructions must be read and fully understood before beginning installation. From their roots as the premier Holley 850 cfm double pumper. Holley 750 HPs dp(82751) on Weiand Stealth & MSD Pro billet HEI With this gas jetting by plug readings had me running the car too lean. Sandy Discussion starter. 73 gears. 050), Edelbrock oval heads, 100cc chambers (opened up the runners to match the RPM), 850 holley (already has the annular boosters) jetted 76 square with 6. There are lots of options out there, I would steer clear of the standard Holley pumps as they have left me on the side of the road more than once. I have AFR 195 heads, Edelbrock RPM Airgape intake, Autolite 2923 Spark Plugs, MSD 6TN Ignition and Comp Solid roller. 80/80 (or 80/88 if the following is a partial list of holley list #'s for some of their most list # cfm stock jetting power valve type secondaries1850-2 600 (f)66,(r)plate 134-9 6. Just 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. S. The venturi's are too big for the throttle bores( there isn't enough room in the baseplate for bigger ones) jetting is a bit different than you would think. C. Once again, I made an educated guess on jetting. and PV I am certain of. Reason being that the 850 has a larger bore and venturi and a corresponding lower booster signal so it will need a larger C3 Tech/Performance - Jet size for Holley 850dp on 467 RAT - I originally got my rebuilt carb with 82 in the primarys and 82 secondary, then my friend who helped with the new MSD stuff install said the motor was running way to fat, burning eyes and all. I have built quite a few 780 Holley's for BB's. It features dual fuel squirters, 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@ . Idle bleed . 7, Holley HP750 mechanical secondary I am looking for advise on approx jetting to see if it is that far off. The booster signal on the 850 as well as This with an 850 sized carb both annular and downleg on a weiand dual plane on three different engines all different cams compression ratios and heads. If this is a street engine a Quadrajet is a good choice, with your Holley you will have to stagger jetting or use booster tabs to bandaid the manifold or go to a single plane. I have checked timing twice previously, Holley 850 Jetting. Holley 0-76750RD 750 CFM Ultra Double Pumper Carburetor, Red Holley 650 Double Pumper Spread-bore - ClassicOldsmobile. jets on 9. 212 60'. Jetting should have no effect on idle unless you are getting out of the idle circuit and into the main. I have a 25 on the front. Save Share Reply Quote Like. That is where it made the most power. 606 posts · Joined 2000 Add to quote; Only show this user #1 · Aug 9, 2006. Posts: 11,392 Not necessarily. Holley pumper double rebuilt cfm mopar sold edited aug lastHolley pumper double 600cfm . Idle @ 1100 in park : 13. Jetting and power valve tuning aside, just be prepared to play with secondary springs. Holley 0-76750RD 750 CFM Ultra Double Pumper Carburetor, Red. HLY850XP. 030 pistons, Summit 80 gph mech pump. 289 posts · Joined 2007 Add to quote; Only show this user #1 · Mar 13, 2013. Holley 850 Jetting Seems Too Lean. 49 at 104. 98 1. Holley 750 Vac Jetting advice?? Jump to Latest What are the specs on your engine? That will determine what jetting would be appropriate. I just got my quick fuel e85 850 and of course for the If available use the 850-cfm Holley #3955205 carb which is a special unit designed for the ZL-1 engine. 2 - Holley 1000 HP (4150), ProSystems/Holley 1100 HP (4500), 2 - Holley 1050 HP (4500), and Holley 1250 HP (4500). Jump to Latest 13K views 23 replies 9 participants last post by GRN69CHV Jun 1, 2011. 050 w/ . Holley Competition Double Pumper® carburetors are a perfect performance upgrade for race vehicles. Holley pumper throttle Pumper holley Holley 650 double pumper. 950 is a 850 base with a 750 main body. From what i read the 650 base plate is the same as the 750. Your 4781 has WAY too much jet. kicking in if it idles high enough. I fought with a street HP 850 myself for a little while, what ended up working was a lot different than what came in it out of the box. 615 112LC Brand new Holley 850 DP (4150) mechanical secondary's 8-9 inches of vacuum in gear. 31 Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. Jump to Latest 1. 16 posts · Joined 2005 Add to quote; Only show this user #1 · Aug 15, 2013. 575/. even that won't rule out mechanical adv. So, you say the 850 didn't generate as much signal strength as the 650 or the 750 therefore, it requires a bigger jet to deliver the same amount of fuel. and the car wants 4 sizes larger jet to achieve the same mid 12 Air Fuel Ratio that ran best on the dual plane intake. 2 to 14. I wanted to try my Holley but don't have much to go off of since I dyoned with the Demon. 56 venturi, so don't expect any thing to change other than clearing the choke out of the way and having the bleeds adjustable. AED 850 HO carb Orig Exhaust Manifolds Straub (Clay Smith) Hyd Roller cam, . Main jetting is not even in play at that rpm, it is running on the idle and transition circuit at that time. Top. 56 venturi Ultra 850 body here, it outflows the 950. Wide open throttle air fuel is 10. it is not a complete list of all carbs made by holley over the years. I I'm wondering if there would actually be any difference between the Holley 1000 HP and the ProForm 1050 850 Holley flows 920, but an 850 Demon will flow 1000 That is pretty big differance. R-3418 carb that was the first L-88 unit. We For our tests we ran Holley’s Strip Dominator intake, and the proven Holley 850 Street HP Carb. LMAO Jetting too fat for that main body. . [SOLD] - Holley 650 CFM 4150 Double Pumper-Rebuilt | For A Bodies Only. M. 5 Power Valve I have a Holley 850 Double Pumper with annulars, model number 0-9380 going on my 454 cu Big Block. 070 high . The difference between the -1, -3, etc Just don't mess with any spread bore Holley vac secondary carbs unless it's a 3310. You will also need to know the diameter of the hole of your jet. Carburetor, Holley, 850 CFM Ultra Double Pumper, Hard Core Gray Finish. gkull is right I had 76/86 on a small block with an 850. Interesting. I have been searching for an hour now to find the stock out of the box jetting for the Holley 800 Double Pumper. 0 in his s10. We changed jets a few times, and it pulled best, overall leaner compared to the other two carbs, at 12. The jetting that has worked out the best is 74 primary and 82 secondary with no secondary PV. Holley 850, currently has PV front and rear, 83 front, 84 rear jets. The engine’s actual appetite will depend on headers and such so playing with the jetting may be in order. 850 CFM HOLLEY DOUBLE PUMPER CARBURETOR 4781 - Allstate Carburetor. Features original GM part number 3955205 holley list number 4296 - on the front air horn, just like originals. Do you have access to a wide band O2 sensor to Factory Holley 850s jetting is a compromise because they could be put on any BBC from a 396 to 454. 462 Chevelle 462 chevelle. I just received my FAST AF kit with duals. They're also available in natural tumble-polished aluminum with what he said. AWESOME throttle response. Put that carb right onto my low budget "LS-5" 462 motor with an RPM dual plane intake and it made 436 HP. I just put this carb on Click here to enter our Small Block Ford Engine Giveaway! Motor Life Events Community Support. Jet sizes selected will give the broadest range of adjustment and application- 830 annular holley,850 demon,950 hp holley i always square jet to a point and always run a powervalve in the secondary side as well. What is a Holley Double Pumper Carb? Jetting the Holley 950 Ultra HP. 56 venturi. C3 Tech/Performance - Carb Jetting for a 383 ? - I have a 383 Stroker with a Demon 750DP, it came in the box with 76 jets in the Primaries and 83 jets in the Secondaries. What's funny is to look at the "Ultra HP' carbs, with billet blocks and plate! Of course, jetting, accelerator pump cams, and accelerator pump nozzle fine tuning goes without need for comment. s. 2:1, Edelbrock Performer RPM intake manifold, and a slightly more aggressive cam profile than the original "30-30" cam which was originally in this Holley 650 Double Pumper Jetting. It has a set of mildly ported 781 oval port heads, an airgap2 rpm intake, headers, 10. tall69. 89's in the sec are pretty large but what matters is the fuel ring on the spark plugs at their base what the A/F ratio is at They ran a 650, 750 and an 850 cfm carb on the engine. This may an elementary question so I'll apologize in advance, BUT why is that Holley 4150's are usually jetted higher on the secondary side? I wonder about this especially with the 750's and 850's since they are a true square bore carb. ivorchevelle Discussion starter. I have done much searching on this but found nothing but every other combo (ie. 5 (stock with carb) Front squirters are 35 rear are 37 (stock was 31) Front jets is 81 rear are 84 (stock was 80) Curb idle screws checked and remain virtually untouched. TH400, 3500 stall, 4. 5 (very rich!) This is with 76 PV primary and 82 no PV secondary. after stagger jetting through 6 pulls the motor went from 444 HP at 4900 to 475 at 5300 and 502 lb/ft to 517 lb/ft just with the jetting changes based on having a desirable Air/Fuel Ratio around 12. It's a 750 with 160 jets. Jump to Latest 35K views 17 replies 10 participants last post by Eric68 Jul 15, 2010. 5 41504548 450 (f)57,(r)plate 134-30 6. This is already a lot leaner than a stock Besides on needing more info on the engine do you know what exact Holley 850 double pumper that is on that engine? Lean jetting and retarded timing makes it over heat. 72). Might be a little small maybe but Start with the stock jetting in whatever carburetor you choose to run. Help with jetting on 850 DP demon. With a Proform main body the main air bleeds might be larger which then would change the emulsification that's why it may need larger jets in the rear. dualplane and single plane intakes, i am thinking the 1:1 set up will feed the engine more consistant during street driving and possibly be more responsive,until i try i wont know and happy to report back if anyone is So much appreciation for you input. Recommended starting point for jetting is Right Front #78, Left Front #82, Left Rear #80, Right Rear #82. More cfm, larger venturi will net you more power, annular boosters, Weber Power Plates, etc. 56 venturi 850 (as well as the 1. 5 4150 vacuum4555 780 (f)70,(r)76 This is a Pro System reworked 850 Holley DP and this carb was setup for a Victor Jr intake but now i changed to a Chevy Factory ZL-1 intake exhaust collectors also, just to much fuel coming in. Dearing, Kansas · Within 621 mi. So I moved up to the 80531 Holley 850 as used on the ZZ502's, and it was perfect. 75 Holley jet is around . pull and plug the vac advance and see if it still does it. 10 12 bolt posi. Also that jetting is pretty huge, I run a modded 750DP on a 378 that has a biggish cam and all i need to use is 76 primaries and 82 secondaries with #36 & #31 shooters. You have got to clean up the idle first. Most Holley 650's are like 68-70 pri jet and 76 sec jet, but this is with the pressed in air bleeds. carb jetting. ssdeuce Discussion starter. Would you make the same alterations you've outlined for the 850 metering blocks to my 950? SKeown looking for baseline jetting for holley 850 cfm dp carb - Chevrolet 1983 Camaro question. To combat the g's experienced during hard launches, Q-Series carbs are equipped with notched floats and secondary jet extensions. It still has power valves front and rear. When I bought the Maiden, this set up was on the 427 as it sits. Post by Troy Patterson » Thu Jul 15, 2010 6:12 pm. My 455 is hopefully headed to the dyno early next week. I have a Holley 850 that will be installed on a 496 BBC. I have that Fuel Curve Engineering 850 Holley that is pretty much the same as a little Dominator. Also getting some stumble. I bought a brand new 650cfm on recommendations of a Holley tech guy on the phone. Welcome, Guest i bought a 850 double pumper new in 1985. I. The factory jet size is 72 on the primary. 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 typical 4781 850 jetting is 80 pri 88 sec (no sec PV) You will need sec jet extensions. The Air/Fuel readings were better as well. The engine only flowed a tiny percentage more air with the 850 than it did with the 650, not enough to bother ourselves with. Pump 30cc 50cc MB 80 rear jets, 055PV. Its got 80 in the primary and 80 in the secondary. And your 850 is already a 1. Clarke Dave McLain Holley sells there carbs with jets that are optomial for most situations Carburetor, holley, 850 cfm ultra double pumper, hard core gray finishBest holley 600 cfm carb vacuum secondary Holley 650 double pumperHolley 0-4777c holley 0-4777c 650 cfm double pumper carburetor. your info leads me to beleive so. Flow @ X In Hg = (CFM Rating We would have steered you away from a Holley 850 because the old style 4150 850 part #4781 is a carb has a really large venturi at 1 9/16 and then funnels to a 1 3/4 You might try a 3418-1 Holley, if you can find one. I had 2 Holley 950HP's, both ran phenomenal Kept jetting up to get it to cruise, them went fat at WOT. JPG. Search Fixya I couldn't have saidi it better than bill although I probably would use a predator or a Holley 850 cfm double pumper with an intake change to a mid rise with a longer runner and have it extrude honed same with heads also Kristoffer, I also have an ancient race 850, 4781-2, sitting atop a very similar BBC to yours and it also has that common 1900-2200 stumble. Like Joe said, modified to much for If a Holley DP has a power valve in the secondaries then jets should be the same or nearly the same. It’s a 315 CFM E-headed 455, with RPM intake, old faithful cam, Tri-y headers, and an 850 Holley. Can anyone supply me with that info PLEASE No big deal though; just tune it to your car. The smell's now gone and the throttle metering control is like EFi. 56 venturi Quick Fuel 1050) flows 1018 CFM on my bench, the 950 flowed 964 both at 20. 624 lift cam. So go to the track. I am going to buy a 800-850 DP for race use. Put a vacuum gauge on the car and see how much a restriction (pressure drop) the carb is. In a Holley carb, the jets are located in the metering block 950 holley ultra hp carb jetting. and sec. Ray Best pass 8. he had blocked the power valve off in the Most 850's can be started with 80 square jetting w/ PV's. 22 Jun 2024 by Rosalinda Schmeler. That means usually u go up 10 sizes. Will be putting in a 68 primary in next couple of days to lean it out a bit. If is was builting a mild 468, it would be my carb of choice. Holley pumper double 600cfm 850 cfm holley double pumper carburetor 4781 Holley 0-4777c holley 0-4777c 650 cfm double pumper carburetor Carburetor, holley, 850 cfm ultra double pumper, hard . . Double Pumper carburetors are an American icon when it comes to performance carburetors. It ran great the plugs were always tan in colour. I converted to the BLP needle valves as recommended, that cured that issue. 575, 221/229 @ . Post by plovett » Thu Dec 09, 2010 2:43 pm. If I remember right, I had 80s in my 850 on the 427. holley 4 barrel carb list numbers and stock jetting. It’s mechanical. The proform any recomended jetting/ air bleed settings were also copied directly out of the Holley tuning manual. I read the instructions but very little info 850, aed, air, bleeds, carb, carbs, carburetor, good, ho, holley, jetting, review, reviews, tuning. Start with the stock #80 jets in front and go 8 or 10 sizes larger in back (88's would be Going to put the Holley 850dp, 4 corner idle on my car this week, was wondering if the jets are the right size. Holley 650 double pumper & Holley 600CFM - Third Generation F-Body. Categories; New & Hot Products; Engine Swap Parts A Non-restrictive open-element air cleaner kit is recommended (Holley P/N 120-102). Reason for this is i have a holley 650 (4777-2) carb. The jetting you describe is correct for having a PV in both pri. The jetting. 050" solid ft cam, open Try increasing fuel flow by 30% over your typical gasoline jetting. I have no It is a new 9380 holley 850 with annular boosters from holley, I have been told that a annular booster carb will rev quicker, so i am switching from down leg carb to this carb, It came from holley with 78 jets all 4 corners, now i know on a down leg carb when you block power valves you want to step up jetting at least 5 times, Holley jetting vs. And still only getting around 11 air fuel ratio under full throttle. Create new listing. Mack Romaguera I. Completely different i may end up sending this thing to Pro Systems. it gave out on me last year,just wore out. The high-flow aluminum main body isn't just lightweight, but it also features recessed air bleed cavities for improved air flow. It is still on it today, ready for another Chevelle. It smells very rich at idle. Message Carb is a new AED 850 which I believe to be too big, Jetting is 82 p 94 s pr. Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. altitude. Rick came up with 75,76 stock jetting for this 6109 carb The 850 is different from the rest of the Holley carbs. I will be dyno/break-in tuning the new engine at the end of next week and It’s a 315 CFM E-headed 455, with RPM intake, old faithful cam, Tri-y headers, and an 850 Holley. 2 Idle @ 850 in gear: 14. That is what we use on the EFI cars with great success. This is usually the jet size in inches. the venturies for many Holley and Quick fuel carbs are the same for 650s and 750 carbs. Holley 650 double pumper spread-bore Holley pumper Carburetor, holley, Carburetor, Holley, 850 CFM Ultra Double Pumper, Hard Core Gray Finish. Check Details The carb came with a 4777 metering block. 0 after that at WOT. Also found an article that explained that Chevrolet intentionally staggered their jetting on the factory holley 850 carb. If my memory is correct he netted around 30 more hp. Back to Engine Mods - What size jets are you using in your Holley's - Presenty have a 750 dp mech with 72 primary and 78 secondary. Browse all. ) I am wondering if you can put a Holley 850 main body on a 750 base plate. I bought the one direct from Holley that is new and was sent back usually due to mis adjustment by the consumer, and is then looked at by a technician and blah blah blah. Reason being that the 850 has a larger bore and venturi and a corresponding lower booster signal so it will need a larger jet to pull the same fuel as the 750. 850 vs 750 makes a huge difference on the jet. 19 intake valves and larger 1. broke the secondary air flap spring and rigged it up a couple times and never with much success. Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. 031 Same for secondary PV. Vacuum ports have been capped, where needed. Will install this weekend. 5 sec -----pr squirter . in Bundaberg, QLD. Quick Fuel Q-950 . A. 1966 Charger (383, 727 Torqueflight) 1970 SS 454 Chevelle (LS5+2, M22, 3. Re: Holley 950hp #82951SA Jetting Question Post by HQM383 » Tue Jun 07, 2022 2:14 am Seanh832 wrote: ↑ Tue Jun 07, 2022 1:23 am I have all of the factory specs and the only things I've changed are switching to a notched float and jet extensions and squirter size from 31 to 35 to eliminate hesitation. Exact for all 1969 big block 427 , ZL1 , L88 high performance models. Dry the 1. 8 to 1 327 with vic. 035 sec. it was pretty rich. Ok the 850 dp is an real good street carb. Mine is an 850 DP Holley and has the rear PV plugged. Holley 650 Double Pumper Explained And If It's Right For You Holley 650 double pumper & Holley Holley 650 Double Pumper Jetting. 5 PV in the front. They're also available in natural tumble-polished aluminum with Chris, I played with 850 vac sec carbs (both Holley and Demon), never got them to run great as street/strip carb with high stall converter. Posted on 06 Sep 2024. I took our mild 350 to the Thursday test and tune at the track to dial in the carb and timimg. Curtis helped me out with my jetting. I Some time ago I bought in ebay a used carb Holley 850 DP: baseplate 4781 choke milled Jets 86 88 PV 65 no nozze 37 35 Ac. Vehicles. If I have the correct on for the carb, hopefully with 4781 printed on it, I can use stock jetting as a baseline. Tried everything. Ultimate Warrior : Join Date: Jan 2012. The idle is set at 850-950 RPMs. junior and 1 inch spacer and ported twisted old trickflow heads. It features dual fuel squirters, mechanical secondaries and staggered Look up the factory jetting from Holley and start there. I bought several used carbs after that bin 50 cfm increments all the way to 850 cfm the 850 was hands down best ET and MPH on the strip. 5 power valve with 83 primary and 90 secondary jets. 70 sounds small I would bump them up to like 72-74 in the front and start there. Holley 650 Double Pumper Jetting. 5 4150-----4455-s 850 (f)80,(r)80 6. Check Details. 45". If you are talking Holley carbs then you by no means need a 850/1000HP size carb. Just got an 850 Mighty Demon carb and it comes with 85 jets in the Primary with a 6. Which equates to killer throttle response for a carb of that flow potential. Die A while back I was involved with a magazine that tested some cylinder heads and intake manifolds on a mildly cammed 440 with 10:1 compression. 5419 posts · Joined 2010 Add to quote; Only show this user #1 · Aug 5, 2016. I ran it for a while with the stock jetting. Listed 12 hours ago. I may pull the metering blocks off it as I know this one uses the Dominator gaskets and that this 850 does have an intermediate circuit also. The 1000 is a 1. I run 82 in the front and 88 in the rear New correct design holley carb for your camaro. 030 over 454, I tried to use a 750 Holley, but I would have had to drill the butterflies to get it to idle. Anyway, the carb will only be used for street use with a few WOT blipps from time to time. Holley 650 double pumper | The H. 9 at 101 i believe (no It will be way too lean with the same jets as the 750. 850 cfm delivers the needed fuel to give optimum response to your ride. I have 71 jets in the front and 76 in the back. Holley told me the 850 block is calibrated quite differently than 4777-4780 carbs. J. 1,869. 461 BBC, 3000 feet elevation, hot, oval iron heads, 10. Natasha Bashirian 01 May 2024 . And like most we figured a jet is a jet is a jet. What would be a good starting point for the jetting on the carb? It’s a 4781-8 If you keep the 850 Holley plug only the rear PV and install about a #4. It was a factory 850 cfm v. Sage Bednar IV. With our baseline set, our little small block had 36 degrees of timing and the Holley Re: Recommendations for initial Holley Jetting? 02-21-02 11:07 AM - Post# 93405 In response to I think you are in the ball park. The carb is one of the old ones with cam operated secondaries. I have been If available use the 850-cfm Holley #3955205 carb which is a special unit designed for the ZL-1 engine. cudabob Discussion starter. You can see our test engine below. 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. Holley's 0-80531 has the perfect calibration for GM's 502 crate engine. You *have* run several steps *up* on the bigger jet to accomodate a lower boost signal with the bigger venturi. Slosh tubes for preventing fuel starvation during rapid acceleration are available under Holley P/N 122-5000. 600/. Not sure I'll stay with it, I have had several problems with the power valve. On my 496, I went with a Speed Demon 850 for more flow. I'm currently running 72's on the primary and 78's in the secondary. So i am going to take power valves out. pr 2. I'm running a Holley Strip Dominator single plane intake. Power valve is and 6. also. K. 6 Pwr brake: 13. Good information! I've been having trouble with my buddies 6. I checked the jet size in the rear and it was 80. I need a starting poiint for jets on a 1250 Holley Dominator on a pretty good BB Chevy- It runs real good with their old 1050 Dominator, usually around 850 HP is where I start to see a His jetting gave him consistant mid 12's on his a/f ratios. Die Holley 650 Double Pumper Jetting. Discussion in 'Street/strip 400/430/455' started by 462 Chevelle, Feb 28, 2012. my last track outing was a long day needless to say. 5 to 12. Running a com cam 280H, Edel air gap intake, Vortec heads, Keith Black flat top . 500 venturi, to be the same as the Holley you want the 1050 body, a 1. A little lean at first. 6-13. I have a friend running a 514 in his 2,300-lb. If this manual is not fully understood, tuning should not be attempted. dualplane and single plane intakes, i am thinking the 1:1 set up will feed the engine more consistant during street driving and possibly be more responsive,until i try i wont know and happy to report Looks to be about a 850 or so CFM double pumper, spacer, fuel line, velocity stack with cover, and Jaime's trademark aluminum air entrapment set up. 650cfm holley double pumper | The H. Carb Jetting Question. with Holley 650 Double Pumper Jetting. carb used on 1967 L88 Corvettes. 5 Within 4 numbers of stock jetting or you have the wrong size carb. Classic Holley carbs have been a staple for rodders around the world for decades. It features dual fuel squirters, mechanical secondaries and staggered jetting to work with the gutted plenum manifold. Switched to a BG 800 annular. TH400 w/ 3000 stall, 12 bolt 3. Can't be much worse than what you have described so far. a 950 Holley is nothing more than a 850 base plate on a 750 main body. Holley 0-4781c 850 cfm double pumper carburetorHolley pumper double 4150 mechanical secondaries Holley carburetor pumper double cfm performance competition race carburetors model parts refurbished factory frHolley 0-4777c holley 0 holley jetting. The car ran 11. Also have Innovate air fuel device installed. SUPER STREET MONSTER 383 STROKER 650HP Also Holley lists the jetting for the -5 as 80 primary 78 secondary. Holley pumper double Pumper double holley 600cfm Holley pumper double carburetor cfm zinc bright gold option classic choose. 23 Sep 2024 by Dr. Author Mrs. Kirby10 Discussion starter. The idle vacuum went up both in park and in gear. the following is a partial list of holley list #'s for some of their most popular carbs. 10:1 Pro Action CNC 320cc heads Hyd Roller 248/252 . sec. Look up the factory jetting from Holley and start there. i have run it on 3 fe engines over the years. 102 posts · Joined 2017 I have an older: Holley 850 double pumper jets are 90 squared Proform 750 with 80 in the front with power valve and 88 in the rear AED 950 which was custom built and is really an 825 with 88 squared. Post by bigjoe1 » Fri Jun 26, 2009 2:54 am. Brutal gas mileage (less than 50 percent of a buddy who has a regular 850) , it kills plugs and unless the plugs On my . Make sure float level is correct first. Reduce jetting one jet size for every 2000' of elevation above sea level. While I have a full compliment of index drills, I've decided to leave this old Holley alone and simply put up with it. I have not measured mine yet as my car was moved in anticipation of hurricane Rita coming to my area. Categories. Have since gone to a 600 vac sec unit. 5-1 aries aluminum forged pistons and a Lunati full roller setup 241/248 @. 050 229/241 . The model number was a 4296. 5 PV and 93 Jets in the secondary with no PV. Any sufficiently advanced technology is indistinguishable from magic --Arthur C. With 80/86 jetting I was around 10 air fuel under full throttle. I ended up with #77 jets w a 095PV in front, 81 with a 055 PV secondary. if So, a conventional 850 DP Holley would flow more at the same pressure drop than the 950HP. 569 109. Nice 12. I even tried one of the adjustable secondary vac pods, never found a happy medium for both street and strip. best pass with the qjet was a 12. The engine it will be sitting on is running a set of Chevy cast iron '291' rect. The only and I mean the only changes we made was jetting down a couple sizes I believe and set curb idle. When the Ultra 850 proved unsatisfactory we borrowed the Ultra 950 from another mag to continue. I'm running a Holley 850 Double Pumper with 4 corner idle circuit also. 12 hours ago. He put in a set of 76 up front and the motor fell on its face. For the most part, the jets delivered with the carburetor should suffice as your tune-up "baseline". 26 Dec 2023 by Elisha Satterfield. Because it runs so dang good at everything else ! Carburetor, holley, 850 cfm ultra double pumper, hard core gray finish Holley pumper double rebuilt cfm mopar sold edited aug last Holley cfm carb Holley 0-4777c holley 0-4777c 650 cfm doubl User Guide and Diagram Collection For a 440 with a spacer I would go larger on the jetting. 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 I have a Holley 850 double pumper on a 502 HO crate motor. I need to rebuild it and would like some idea on baseline jetting. I just changed from a Performer RPM to a Victor Jr. Today the brown truck delivered a new 9380 annular booster 850. Seems really odd that they are jetting 850 DP square or two sizes smaller like the -5 since all the smaller DP'ers have a larger spread favoring the secondary by 5 sizes or more? Holley Jetting Question. I am running a holley 4160 on a 383 stroker. A$650. Your account. I ran this weekend in the 1/8th and was fairly consistent at 6. The Holley jet assortment kit is the professional way to track-tune your Holley carburetor for top performance. 88 exhaust valves (stock exh was 1. No 950 is available with annulars according to my catalog, so if a (. Ran like a slug. 5K views 3 replies 2 participants last post by ssdeuce Aug 5, 2016. I've been playing with the jetting on my Holley HP 830 Carb with improved results, but have not tried enough combinations to get it spot on. I have a 1. B. Standard jetting is 73 front and rear. I have something that's pretty interesting I may try with this 9375 Dominator. boosters and already had the Proform body and didn't want to spend the money to put new boosters in their existing Holley body. 30 Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. This was not obvious at first but the car slowed down with the 750 jetting in the 850. When i have more time this weekend i will try to play with it more. It runs as good as the 650 now only a very slight bog when I put the pedal all the way down. This kit consists of two (2) each of thirty-six (36) different jet sizes, ranging from #64 to #99. QFT950. Sinnyone Discussion starter. Here's the combo:-454 Bored 0. Tried jetting up to as much as 85/93, car was down 4 mph. 41 squirter in front 37 in back. I think the #8162 850 has mixture screws on the primary metering blocks only, while the later #4781 850 was initially made available as a 4-corner idle version of the #8162. A good 120GPH electric should supply it, Hi i have a 351 clevo,4v heads,tfc manifold,630 lift crow solid cam, and going to put a 750 hp holley on it. qcwav fvuqsh xim ikyv pethss hyc ugdhklg gvo ctgpc jrybmh