What cfm carb for 454. (clone): 489ci BBC (454 block, 4.

What cfm carb for 454 2:1 compression Hyper-eutectic pistons Comp Cams XE268H - 268/280 duration (224/230 @ 050) 515/520 I/E lift Weiand 8013 dual plane manifold (Idle - 6500) Proform HEI 1. A mech sec carb can get mileage if you stay out of the secondaries while cruising. If you have an automatic transmission you will need a vacuum sec. Send Private Topic just found a 3310-1 780 cfm :-) 1981 shortbed 355ci. gglaitt86-autoparts (360) 98. S. Here is the carb I think if you want to run a tunnel ram on the street keep the carbs smaller like 500-600 cfm (per carb) and get the smallest plenum manifold possible. 8 out of The carb and linkage are ready for the install. O. 17. So, if you are So at 5000 rpm, your 454 only needs 656 cfm at 100% volumetric efficiency. The 280 CFM carburetor has not been cleaned or adjusted in more than a decade. Holley 9380-1 dirt track carb 850 cfm performance dirt double pumper. 141-60foot 4300lb heavy Email Report 69panel Super Senior Member Posts: 4279 C3 Tech/Performance - 750 CFM on a 454? - I'm at the end of my patience. Older 454 truck engines all came with Q-jet carburetors that were rated at 750 cfm. what a Hey guys I just rebuilt my street carb for my 454 and wondered what the jetting should be for this carb on this motor. com FREE DELIVERY possible on eligible purchases Compatible with Chevy Quadrajet 1901R 4MV Chevy 66-73 Hi I'm after some carb recommendations for my 454 BBC. Too bad chevy never Optimal CFM range: 550-650. Edelbrock does make a 800 cfm carb, that would be the smallest I would ever use and it wouldn't be for max CFM: This 4 barrel carburetor for Rochester Quadrajet can range anywhere in between 600 - 800 CFM, most are rated 750 CFM. Wondering if anyone has any real world numbers or input. Aug 22, 2024. The choke has been removed, but the choke horn is still there. I plan to order one of those Edelbrock Thunder AVS (800 CFM) carbs or perhaps a Holley Street Avenger 770 CFM? Headers, 2-1/2" dual exhaust, turbo mufflers, and tailpipes are planned. After much investigation I elected to go with a 800 cfm , mech, sec, double pumper MIGHTY DEMON without choke and with annular discharge . And as you said leave some room for growth on the motor. Came out of a 1999 2500 suburban. the carb isn't new its a rebuilt unit out of rebuild company in Indianapolis. E. I'm pretty sure that's the way I will go. 05 cam seems a bit large to me. User Info. Also, I adjusted the float levels, and I know a guy that runs a 1050 dominator on a 454 in a 67 Chevelle that is a street car. I built my big block as follows: 460 cu/in (454, 0. 9. Dyno target: 425 hp. 85cr Carb Size for 454? The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In To if its a stock or near stock 454 Id use either a Q-jet or a 750 cfm carb. 4 l engine. Lean calibration for maximum fuel economy. For 8 Cylinder Mercury More experienced people knew from looking at the specifications, that the 950HP used a 1. etedeschi72; Sep 7, 2024; Engine & Performance; Replies 10 Views 1K. Optimize your engine's performance with the Carburetor CFM Calculator. The Cadillac and Chevrolet Q-jets are the only ones with a 90-degree fuel inlet, and the The same rule with head port size applies to carb size, smaller area equalls better low rpm velocities. 1st pic is a list# Recommend a carb for stock 454 for mileage and performance. A 650 carburetor would better suit the 454 and may even need bigger if the 454 has had performance modifications. A bit of a orphan, but not a race carb, is it? Gene ACES 3112/Team Chevelle Gold #62 67 SS396, MJ467,M23Z, oem 12bolt. No problems with either one of them. Design The QJet is a large 4 barrel carburetor that has a small primary side for fuel economy and good emissions and a large secondary side for good performance. Jet boat with a "B" impellor. $200 We Do Not sell rebuilt or refurbished Carbs or TBIs: Brand: Rochester Type: R4-M4MC Quadrajet Qjet Number: 17084502: CU: 4-661: General Reference Picture of a R4-M4MC This carburetor has a part number of 17084502 and used on 80-84 Chev & GMC Truck Mtr Home 454 . 4L Rochester Quadrajet Carburetor 4 Barrel for Chevy 327 350 427 454 Engines 1966-1973 Trucks and Cars, Replaces 1975-1979 Corvettes 1901R 750 CFM 1901-GG 4BBL Carb (4 barrel quadrajet carburetor 4MV) New 4 Barrel Carburetor for 1901R Rochester Quadrajet 4MV 1966-1973 big small block GMC Corvettes 1975-1979 Manual Divorced Choke 750 CFM Engines so im going through my engine, trying to nail the tune down and im starting to suspect my carb is too much. 42s I currently have a edelbrock carb on my 454 chevy motor. A 750 cfm seems to work the best for most mild 454's. Here is the formula in numbers: 454 x 4400= 1997600 div by 3456=578 cfm. Is the 600 CFM Holley going to work on a stock 454 motor, at least till I can get a 750? General Q & A - What jets for stock 454 w/750cfm Holley 4150 - The engine is a stock OMC454 oval port with a Weiand Stealth intake and straight thru 4" exhaust, stock exhaust manifolds. where he's running an aftermarket perf cam,headers,and light port work on the heads just about any properly setup 750 cfm carb will out perf the bottom feeder 585-600 cfm About this item . On my flow bench, an 850 Holley flows between 849 and 851 cfm dry (no fuel going through it) but even a mild 454, unless really poorly spec’d, is still an air-hungry engine. 10. Carbs have stock jets & rods seams to run a little rich. So, seems that the primary consideration in carb choice would center around what RPM range you're running at WOT. Stock jetting was at 73 primary, 56 secondary. I have a brand new 600 CFM Holley 0-1850 Carberator with vacuum secondaries and electric choke. bore x stroke-- 4. Tom B '71 540 Street/Strip Monte Carlo 10. waltyotur 4 View Full Version : Proper CFM carb for 330hp 454? baddogz28. I called Edelbrock and the recommended the 650cfm. This means with the proper carburetor installed for the application, we generally will get better performance. I've seen people running 454's with 500 cfm carbs just because they're around town cars and never get rev'd above 4k rpms. Provides excellent fuel economy when used on 454 c. A 454 big-block that revs up to 5,900 rpm would need: 454x5900/3456=775. Optimal CFM range: 600 Brand new Chevy / GM 454 / 7. carb, a Just installed new 454 and have 750 CFM Holley carb currently but looking to replace it with more modern Carb. Need some reccomendations on what carb i should replace this with. Having said that I have a 800 edelbrock on my 454 that was making similar power to yours and it worked very well. I don't think you have run 1910 Remanufactured Rochester Quadrajet Carburetor 850 CFM Hi-Perf 454-502 BBC. Save Share REMAN EDELBROCK 1901 QUADRAJET CARBURETOR 750 CFM 1966-1973 CHEVY GM 327-454. With the original motor, I would rebuild it due to it's value and the time it was sitting. It has a mild cam, 4. Rebuilding a 454 and swapped from tbi to carb. I've slept since thenbut I'm almost positive it ID'd as a 800 Find CHEVROLET 7. is rated New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Divorced Choke 1901-GG 750 4 barrel carb exact copy replace Edelbrock #1906 AVS2 Carburetor 650 CFM Electric Choke Carburetor suitable for: 1980-1989 Chevrolet, GMC 7. $4,000. s will be Post: 454+ holley carb = what jets (Topic#46591) Doorslammer Senior Member Posts: 304 Loc: Central Florida Reg: 02-07-03. i Engine GM Cadillac 1980-1989 4BBL Carb Vacuum Secondary 750 CFM with Electric More Street-Carb CFM. '72 Greenbrier Wagon: 454, 700R4, 12 bolt with 3. Can anyone suggest what size carbs to put on a street driven 86 pickup with a basically stock 454. The fact that a motor only pulls 800 cfm through THAT carb and intake setupdoesn't mean that's all it wants. 31 12 bolt posi 71 camaro. 25 stroke crank, . 10 or better maybe 3. The total CFM of two carburetors, depending on what intake you use, and the number of do-dads you insert between the carbs and the manifold, is going to vary Find CHEVROLET 7. 4BBL Carburetor For Edelbrock Rochester Quadrajet Chevy Engine 327 350 427 454. 73 at the least. I have a Carter 750 cfm carb on a moderately built 454 fresh rebuild. 030 over) What would be a good carb for my setup? Have a street dominator manifold also. or Best Offer. 030 over KB flat-top pistons, 296/306 hyd cam, etc. I would go with the carb with the smallest primary throttle bore sizes for fuel economy and throttle response. Buy New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Divorced Choke 1901-GG 750 CFM: Carburetors - Amazon. 08 gear), Wilwood front disk brakes, Corvette rally wheels and tires Looks plenty nastly especially with carb spacers (which add power to this). 00 $ 188 . Carb CFM fluctuates based on the CFM requirements of the engine. Ive got a 770 Holley on my mild 454. Short of a Pro Mod or Funny car, ther aren't many engines approaching 100% efficiency. Rochester Quadrajet Carburetor 4 Barrel Carburetor - Compatible with Chevy Quadrajet 1901R 4MV Chevy 66-73 Manual Divorced Choke Replace Corvettes 75-79 750 CFM Carb Chevrolet Engines 327 350 427 454 2. As a point of reference, 850-cfm carburetors use a 1. You can often find power in carb tweeks that don't necessarily show dramtically more airflow. Too much carb and it'll probably be a stinker to tune. FREE delivery Jan 15 - 17 . Verified purchase. Use the 2x 650 AVS2 carbs or the 750 carbs onit. Gearing I would say 4. 30 is a comp cam XR270HR part# 11-422-8. 454 . Some are, some aren't. $200. Chevrolet and 460 c. Reactions: magicrat56 and Aml383. I have read here on TC that 650 through 800 Holley's share the same baseplate and I also read that after using the Proform main body the carb would flow around 830 cfm. ? If so What would be the right cfm carb? thank's . Think of it this way: A 950 cfm carb has a larger area to flow though compared to a 650 cfm carb. flynbuick Guest. 11 gears, THM 400. I dont have pics. Best 454 all around build. That carburetor sure woke that engine up. 5" collector hooker comp headers. They can work real well for mild to wild 454 big blocks but a step up in CFM will pay off with more power. And at 5700 RPM carb should be 750 cfm. 25 stroke steel crank,small dome pistons,990 rectangle port heads and full mechanical roller set up, and single plane intake. 25 inches. This and other formulas turn up all the time but dynos and everyday driving prove that they don't work. Biology; Carburetor CFM Calculator “Suzie’s craving a 747 CFM beast!” Muscle Max: 454: 7000 Rick, Typically a 454 of the specs you are showing would use like a 750 cfm carb with a duel plane intake. Part Number: JET-33004. A switch to a 600-650 cfm carb would provide more low rpm power and would still not run out of carb at 5000 rpm, which your motor probably never see's anyway. 00 shipping. This means that if you have to consider using a 4150-style carb it is at the upper limit of airflow for the carb 500cfm vs 600 cfm Thanx T. Is a 1050 dominator too much carb for a 489c. for a 1970 Chevelle 454? Thanks, Todd . 250x4. A good Q-jet is your best choice for a carb, unless you go to a newer electronic fuel injection system. Its a 4777 650 cfm DP no rear power valve and 6. Past 6 months. 99. -----"A 454 that tops out at 5,000 RPM would require 656. Ford Performer applications. 2477 posts Both Holley's are 780 cfm vacuum secondary models. 5. 5-1 comp. PRW 454 1. 4L/454 Carburetors Spread bore Carburetor Flange and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 15% back up to $150 Carburetor, Marine, 650 cfm, 4-Barrel, Spread Bore, Single Inlet, Natural, Universal Style Linkage, Each. 0-3310S Model Carburetor Compatible with Holley 4160 Street Performance 750 CFM Square Bore 4-Barrel Vacuum Secondary Manual Choke New Hey guys building a 454 in a 86 chevy dually for towing a toy hauler. NOTE:This chevy carburetor is suitable for automotive. 0 out of 5 stars 19 Some years ago I built a mild 454 for my friend's jet boat, perhaps in the same horsepower range, 049 oval heads. 4 with electric c. A stock 454 will turn a better time at the dragstrip with a 600cfm than a 750 cfm double pumper Figured that a 600CFM carb might be a little small for 454 that will potentially operate up to the 5000 RPM range. Im putting an Edelbrock Street tunnel ram 2x4 on and need to now what the best carb CFM im going to need. East Mesa Holley 470cfm carburetor. It's basically a 750 main body with an 850 baseplate. 86burban; Apr 11, 2024; Carb Fuel Systems; Replies 14 Views 2K. Very little tuning was needed on the carbs (minor changes to jetting and metering rods). Chevy 454 There are those who speak only in Chevy Rat motor terms when it comes to making power and torque. Remanufactured · Edelbrock (11) $449. a 750 cfm carb will work just fine. Here’s a quick overview of the best carb for 454 Chevy: Best carburetor for stock to mild 454: For more oomph! and step-on-the-gas feel, get the Edelbrock 1407 Performer with its mechanical ANSWER You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. it's a good compromoise between a 750 and a 850/1000HP. 496ci CFM Ported Brodix Race-Rites 310cc, 394/275cfm, 10. In 2nd gear, the Compatible with 1980-1989 Big Block Chevy/GMC 454 Truck Applications Electric Choke CARB GM/CHEVY Remanufactured 4-bbl. Vortec fuel injection converted to carb. Just like one on here a while back. thus is a 650+ capable inductionvsystem on 454 bbc. Smith (Edelbrock):Edelbrock's Thunder Series 800-cfm carb—PN 1812 for manual choke or PN 1813 for electric choke—is the way to go. Engines in the 350-450 cubic inch range benefit from a 750 CFM carb, while larger engines may require 850-950 CFM. 95. 4L/454 Chevy big block Mark IV Carburetors and get Free Shipping on Orders Over $109 at Summit Racing! More Power in Every Purchase - Join the Summit Rewards Program Today! Carburetor, Marine, 650 cfm, 4-Barrel, Spread Bore, Single Inlet, Natural, Universal Style Linkage, Each. Anyway, 750cfm is fine for stock to mild 454 big blocks. welp something wasn’t bolted in right and my radiator leaned into my fan and cut into it a little. first, its a 454 bored 30 over KB hyper pistons,228-238 ( im 90 % sure without looking at records ) cam, roller lifters, nodular crank, 9. Hal 【CFM】Carburetor for Rochester Quadrajet can range anywhere in between 600 and 800 CFM. Carb selection for a 454 . The amount of CFM required will determine carburetor size and quantity. Also be sure you have a good high volume fuel pump. Details 454 BBC (stock), 330hp, Edelbrock Torker 2-0 manifold, runs on gasoline Let me know if there's anything else that needs to be known, Thx in Putting 1500 cfm worth of carbs on an engine is not going to make the engine use 1500 cfm so I doubt very much your engine used 100% of the 1500 cfm available. Everybody seems to be using a pair of 600's but is that too much? It's going to be 90% street driven. Vehicle ===== I used 500 CFM Carter AFBs with a progressive linkage. d. But A 650 cfm carb is too small for your 454 combo!. Edelbrock 750 cfm or 600 cfm carburetor for 454 stock engine. 454 13:1 etc. Check for vacume leaks also , they can cause stalling _____ Actually, it is a 850 cfm, and it would not be the best choice for a stick car with gears. stall, runs low 12's on the quarter. The secondary jets were that much smaller. Blue build collar ram tunnel nitrous carburetors chevrolet part chevy engine ccrp 1303 hp plus email google twitterRochester quadrajet carburetor 4l cid barrel gmc cfm chevrolet four Quadrajet rochester carburetor carb barrel chokeCarb for a rebuilt 74 454 corvetteforum chevrolet The caddy carbs are appx 820 CFM as actually measured, and the rest are appx 730 CFM, and feed everything from a 283 to a 454. 1405 Carburetor For 600 CFM 4 Barrel Performance Carb with Manual Electric Choke (For: Chevrolet) LOREADA Rochester Quadrajet Carburetor 4 Barrel for Chevy 350 327 396 400 402 427 454 Engines Car View on Amazon: 4: Rochester Quadrajet Carburetor 4 Barrel for Chevy 327 350 427 454 Engines 1966-1973 Trucks and Cars, View on Amazon: 5: 4 Barrel Carburetor Carb For 1901R Rochester Quadrajet 4MV Chevy Engine 327 350 427 454 1966 There's been several threads in years past for minimum upgrades to the RV Mark IV PP 454 enginesbut some of the parts links are bad and /or discontinued. 0 out of 5 stars. 373 posi,NOS 100hp shot 13. the car is 100 percent Street driven and only see Max 5000 rpm on the street. The closer the match of the carb and engine the better the signal through the circuits and the better it will deliver good air fuel ratios over the rpm and load conditions. 0 out of 5 The cam I am running in my 454 bored . REPLACES 9779S These carbs where assembled using only the highest quality components, They feature: All 454, your gut is correct, better a tad too small. 4 LITER 454 CID BIG BLOCK MERCRUISER ENGINE Rochester 4 Barrel Quadrajet With. Greg 454 Ventura Hatchback A population of 4mil, I had the only Ventura New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Divorced Choke 1901-GG 750 CFM 200. 520 BBC 6. Rochester quadrajet m4me 750 cfm carburetor with electric choke -for 3Rochester quadrajet m4me 800 cfm carburetor -for big block engines, el Sell 2 x 4 holley #4224-s (660 cfm) center squirter carburetor dualTop 10 best carburetor for 454 big block based on scores. I have a 396 now gonna build a 454 soon and wanted to get some opinions. Check here for specific Muscle car Info: Referenced by ; Rochester 17084502 I've run 635 cfm and 750 cfm carbs on a 454 with oval port heads and Weind tunnel ram. whats the best carb for a 454 . The Marine carb has safety features that help contain the fuel from being Fill in the fields below (example: 5000 RPM), click calculate, and we’ll show you the optimal cfm for the street and track! The ratings are different because street engines have a volumetric efficiency around 85% while racing engines are 【CFM】Carburetor For Rochester Quadrajet can range anywhere in between 600 and 800 CFM. Also, the OP's carb is a standard 800 cfm DP with downleg boosters. I thought the car came with a Rochester 750cfm. The Edelbrock Performer Series Marine Square Bore Air Valve Secondary Electric Choke New Carburetor features modified bowl venting, specially designed throttle shafts, accelerator pump seal, 3/8 inch inverted I am not sure what cfm I should get for my stock 71 454. Figure weight of toy hauler to be around 12000 to 15000. Chevelle Malibu ss 64 489 BB with parts from Lewis racing Alumitech radiator with dual spals Had a buddy in the late 70's with one of them LS-5 cars and he put an 800 Spread bore Holley on that 454. It has air conditioning and power brakes/power steering if that makes a difference. Thanks very much . At 5300 RPM carb should be 700 cfm. 0 intake long tube headers dual flow master exhaust . On recommendation from a friend, I put an Edelbrock AVS 650 cfm on there. Save Share Like. $20. Also remember that a 1000HP is dimensionally the same as an 850. 578. Yes, way too much CFM carb for an application, a boggy engine, I get that, but that is an extreme. The RA052007 is now ONLY used on the standard 454 or the pre Check Details Marine carburetor rochester quadrajet 454 crusader 7. Instead of one little carb. Great to deal with, quick shipping, great packaging. 85 = 558 cfm. Will this big of a cam require a larger carburetor than I am using now (600 cfm holley), or do I just need to do more adjusting on the carb and timing? As 454 Tunnel Ram carb size. If it's already a throttle body setup, BE SURE THAT THE CAM IS COMPATIBLE WITH IT. Ritgt now, it is actually on my SBC 350, until the new . $166. They have smaller primary throttle bores than typical 4barrels. It has a rpm performer intake and going to add long tube headers but other than that its a stock 454 bottom end and heads are stock for now. $275. Cam will 650 CFM V4 Barrel Carburetor RA052007. ELECTRIC CHOKE UPGRADE. $179. ali_c20. isn't it According to their site, the 750 is best for the 454 Chevy and 460 Ford for best mileage. HOLLEY QUICK FUEL BRAWLER STREET CARBURETOR,750 CFM,4150,4BBL,ELECTRIC CHOKE,MECHANICAL SECONDARIES. from China. Don't be a pussy and put a Yes the 454 quad is a 750 CFM. 7 rocker arms Double valve springs Edelbrock Performer RPM Air gap intake High volume fuel pump Dish top pistons With the annular primary boosters it flows about 580 cfm. my set-up 461ci 9. New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Patrick told me "Let it breathe man!!!!!" so I put a 1050 on it. Going to keep it pretty much stock except for an HEI. I would think a 750/770/or 800 cfm would be a better carb size for stock 454. To answer your 2nd question, 2 1/2 inch exhaust on a stock system is just fine as 3" will not add any power with that level of HP and torque. 4%. According to that source, a 454 @ 4900 RPM carb should be 650 cfm. Is a 650cfm going to be to small? The formula for choosing a carb indicates a 650cfm should be fine. Idle Mixture Screws Do Not Adjust Anything on 1974 454. Most are rated 750 CFM. While the Demon is a decent carb,when we have had problems with them we got little help from Demon. -Our carburetors are set up more specifically than most other manufactures. It will make very big power . It had a 715 (that's right, 715, not 750) cfm Holley, ran great, right around 62-63 mph,, heavy 20' open bow boat. In my opinion, 650 CFM is too small for a 454. 7:1 Stamped The Qjet carbs the 454 came with are 750. Jetting 72/80 . The squarebore 600 carb/Q-jet adapter combo is a losing proposition, and there's no way the mismatched intake What is a good starting point as far as jet & rod size for dual 750 cfm carbs on a gen VI 502 with a 6-71 blower? It has edelbrock performer rpm Oval port heads . Sort by Oldest first Oldest first Newest first Most reactions. Howdy. Brand New Carb. 632 lift rollar cam about 9 to 1 compresion msd pro billet distributor mech advance, 2" primary 3. The 750 was way too big for that engine and cam. 4 LITER MERCRUISER WITH ELECTRIC CHOKE. 574/0. You I'm getting ready to rebuild this double pump carb (mechanical secondaries) that came off of a SBC. Mesa 427 cubic inch forged stroker small block Chevy engine Carter Edelbrock AFB Performer 750 CFM Carburetor. As it was my daily driver, I didn't have time to futz with the carb and heard about the drivability of Edelbrock carbs. It's acting up. - I've see this mentioned a few times - running a 600cfm carb on a big block will yield better economy for lower RPM operation. In the example above, you 454 th400 750cfm edlebrock carb edlebrock performer2. If you get hesitations and low power then it will need the larger jets or bigger carb. 040 over = 462 ci Stock 049 casting oval port heads 10. Yes, bigger would pull harder up top but the little Rochester Quadrajet Carburetor 4 Barrel for Chevy 327 350 427 454 Engines 1966-1973 Trucks and Cars, Replaces 1975-1979 Corvettes 1901R 750 CFM 1901-GG 4BBL Carb (rochester 4 barrel carburetor 1901R) BBL Carburetor for Re: Setting an edelbrock 600cfm for BBC 454 10-05-02 01:47 AM - Post# 128274 In response to bigjimzlll You must run a regulator set at 5. However, there are other factors involved as well. Best carb for 454 chevy: fueling your big block performanceAsk away! with jeff smith: is a 600 cfm carburetor enough to feed a 454 Carburetor Buy Rochester Quadrajet Carburetor 4 Barrel Carburetor - Compatible with Chevy Quadrajet 1901R 4MV Chevy 66-73 Manual Divorced Choke Replace Corvettes 75-79 750 CFM Carb Chevrolet Engines 327 350 If a 350 small-block is good with a 750 carb, a 454 needs a carb of some 970 cfm just to keep pace in terms of CFM per cubic inch. 7) + 1} = CFM required. trying to feed a wild 454", each of the 2 carb. If you want a mild/cruising 327, stick to the Edelbrock 1405 Performer again. Scottsdale Carburetor Adapter, 4-Hole, Square Bore Carb to Spread Bore Manifold. ), headers w/ new 3” dual exh. I don't see how progressive linkage could work very well with small plenium and long runners without fuel 750 cfm Carburetor with square-flange and electric choke For 402 c. Gary Anderson . Fast forward to a 550+hp 454 and 3. Sponsored. this said i also just happen to have a brand new 750 cfm just sitting around that i have no use for will it be to much for the 327? not going faster. I always run a tunnelram with direct linkage on the primaries. $637. i. com: rochester quadrajet carburetor 4 barrel for chevy 1966-1973. here is what it looks like in a video. Thread starter 86burban; Start date Apr 11, 2024; Which cfm of carburetor do you recommend for Edelbrock carburetor on a 1984 Chevy C30 crew cab with a stock engine? I'm looking for fuel economy. 174 sold. 310, @ 129. Remember, a 950 HP isn't as large as you might think. premium gas, eddlebrock intake , carb ( 850 ) 290 closed chamber oval heads , it just runs really rich. Opens in a new window or tab. 95 $ 637. But somehow 4. The small primraries give good fuel mileage (relatively) with the large secondaries still providing 700-750 CFM at W. 55 12 bolt and a Because carburetors typically come with CFM ratings that are rounded off to the nearest 50 or 100, you would select a carburetor with a CFM rating that is the next step up from the result of your calculation. (clone): 489ci BBC (454 block, 4. For a 454 cubic inch engine, a carburetor in the range of 800-950 CFM is typically suitable, depending on the specific application. T. Thats not a typo. etc to get an additional 30 cfm out of that GM hipo carb. The carb was looking down into the webbing of the 4 hole intake. Add to cart-Remove. The stock carb is a 750cfm 4150 style marine. For some reason folks dont have a ton of luck with waltyotur 4 Barrel Carburetor Replacement for Chevrolet Engines 327 350 427 454 | Carb Replacement for 1901R Rochester Quadrajet 4MV Chevy 1966-1973 1901-GG 4-BBL/for Corvettes 1975-1979 750 CFM Carburetor 4 Barrel the 4779 750 DP is a great carb from 396 to 454 as well. I just wanted to add when I pulled the old carb off it was sitting on a 1" open spacer. DOES NOT COME WITH SPACER GASKET! Please click HERE to add spacer gasket; Part # RM0054B. 90's, the DP's gives me the best seat-of-the-pans feel when getting into the secondaries. It has 70 front jets and 80 rear jets (the way it was when I bought it). Free shipping. Again, to be in the "safe" zone of 100-150 CFM above your engine's requirements, a 14" x 3. cfm Pro Posts: 301 New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Divorced Choke 1901-GG 750 CFM 200 $188. I've also seen 1,100 cfm carbs used because the engine is running a 1/4 mile at a time and lives most of its life in a trailer. We will adding a 6-71 supercharger and two Holley carbs. He will not be bored. 56- inch venturi, and 650-cfm carburetors use a venturi with a diameter of 1. As a proud owner of the classic Chevy pickup truck. 89@102mph 1/8 General Q & A - 454 with a 600cfm carblooking for economy. My 830 cfm came with 76 primary, 86 secondary. " Using the calculations for the 383 we can see a 14" x 3" filter would suffice for the requirements of this engine, and give you the 100-150 CFM overhead. Additionally Spreadbore get a Quadrajet squarebore get a Holley 3310 750 cfm vacuum carb. I have the Holley LIST 6211 800 CFM spreadbore on my 70 LS5 with a 1968 Aluminum GM spreadbore Corvette manifold. Joe Baring; Just installed new 454 and have 750 CFM Holley carb currently but looking to replace it with more modern Carb. I don't think the 600's would over carb your setup. The difference was amazing. 7. Not sure of the cfm, have to look it up yet. 4. Plenty enough carb . Compatible: 4 Barrel carburetor for 1901R quadrajet 4MV 4-BBL carburetor parts compatible with 1966-1973 327-454c. No single plane on that motor. 8 out of 5 stars. Buy New Rochester Quadrajet Carburetor 4 Barrel for Chevy 305 350 427 454 327 V8 Engines 4MV Chevrolet GMC pickup Trucks 1966-1973 1901R Carb Corvettes 750 CFM Vacuum Secondary Manual Divorced Choke: Hey guys, just wanted to get your opinion on your favorite carb for a 454 moderate cam 450-500 hp range. Best carb for Chevy 327: If you want to conquer the tracks, grab a 4150 Holley Street Avenger 670 CFM. Carburetor Q-Jet Casting 750 CFM Vacuum Secondary Electric Choke Big Block Calibration For Chevy with New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Engines GMC Trucks 1966-1973 big small block 4BBL Carb 1901R 4MV Corvettes 1975-1979 Manual Divorced Choke 1901-GG 750 CFM. I'm looking for max performance in a 72 455 if the QJet is not an option. I have cleaned/rebuilt the carb 3 times, replaced plugs, and have no vaccum leaks. Only 1 left! 750 Cfm Carburetor Electric Choke; Chevy 350 Carburetor Edelbrock; Edelbrock Carburetor 600 Cfm; Edelbrock Marine Carburetor; 650 Edelbrock; A: The size of carb(s) or CFM required for a given application can be calculated by the following formula A: {(CID x RPM) / 3456} x {Boost: 14. and larger Performer applications. I would see how the engine runs with the 570 cfm carb as is first and you may find it will run the 454 just fine and nothing needs to be done. 70 chevelle, SS clone 454 4 speed 3. In your case, a near stock 454 spinning to about 5000 would like 656 cfm. It drinks gas at a ridiculous rate, and fouls plugs. 39 @ 101mph 2. 16 CFM. 770 with vacuum secondaries I dont think you'll find as forgiving and easy to tune than a venerable 750 cfm 3310. Properly setup a 770 carb should do well, especially vac secondary. Its not a race truck just a tow pig or commuter to where ever it goes lol. Any Suggestions? I calculated the Formula 454*6000rpm / 3456 to get to a recommended carb (788cfm). This typically produces a gain of 6 to 8 CFM, as mentioned by George, is NOT an additive property. I was faced with this decision a few years ago when I did buildup on the motor. New Rochester Quadrajet Carburetor 4 Barrel For Chevy 350 454 327 427 V8 Rochester Quadrajet 4 Barrel Carburetor For Edelbrock 1901R Chevy 1966-1973 Engine 327 350 427 454, For Corvettes 1975-1979 750 CFM Vacuum Secondary Durable 4MV 1901-GG W/Jets Kit Manual Choke in Carburetors. A major issue is the height of t A 750 carb is not the same as another 750 carb is not the same as another 750 carb! Most 'universal performance' 600-650 carbs are calibrated for small blocks. No chevy motors ever got the 800cfm q-jets,just olds/caddy/pontiac larger displacement engines like 455 & up got them with a few smaller 400 poncho's getting the 800 cfm carbs too. 07 12 bolt 66 chevelle 350 4 speed 3. I have a like brand new Holley 600 cfm vac performance carb dual feed carb rare with metering blocks front and rear and jets frt/rear too 175. Save Share 75 GMC C-15 shortbed/stepside, factory 454. 5" filter would carry 923. com: 4 barrel mechanical carburetor for rochester quadrajet 4mvQuadrajet rochester cfm carburetor Best carb for 454 530hpAmazon. Also remember that smaller carbs generally have better throttle response but kill the top-end. 85% is a good estimate for most street motors, so 656 x . Go with the Holley, #3310 vacuum secondaries or the Holley, #4779 double pumper with mechanical secondaries, both of these carbs are 750 cfm and I might add, you will feel the difference in performance! Seems to indicate between a 750 and 870 cfm carb for your motor. A 750 cfm carb would be appropriate for your combo though more information about your cam specs and cylinder head casting numbers/compression ratio would help The carb currently on the car looks like a spreadbore. I've got a set of freshly-rebuilt (stock) 781 heads, and a used Torker II intake. zh5682 (3,157) 97. We had two 3310 carbs and the throttle linkage of the rear carb hits the vacuum diaphragm on the front carb. -Each carburetor is wet flow tested, and set to a baseline at the factory. JD Miller. Racepro mufflers, built TH350 w/3500 stall converter, 12 bolt rear (3. Pass LEAPTREND Carburetor 1906 AVS2 650 CFM with Electric Choke Compatible with 1906 AVS2 Series 650CFM Carburetor 4 Barrel Annular Booster Satin Finish Square Bore It's a 750 CFM marine carb being used Find CHEVROLET 7. 03-15-2010, 09:00 PM. 83 CFM. I realize the carb formula doesnt lie for most power on top end but 950 cfm for a mid range perf 454 on the street with a fairly mild 238 dur @. John _____ 75 GMC C-15 short/step factory 454, lowered 03-19-2006, 11:00 PM Rochester Quadrajet Carburetor For Chevy 327 350 427 454 750 CFM 4 Barrel 4MV (For: Chevrolet) Opens in a new window or tab. 00 MARINE CARBURETOR WEBER 4 BARREL FOR 454 CID / 7. Factory used a 800 cfm Rochester QuadraJet or a780 cfm Holley carb on the 454 with hydraulic cams and a Holley 850 double pumper with a solid cam. 67 Chevelle SS '75 Laguna S3, 454 HYD Roller '72 Buick GSX Clone (looking for a Buy THUNDERMINGO New Rochester Quadrajet Carburetor 4 Barrel Carb 4MV 1904R 1906R Fits for Chevy Chevrolet 305 350 c. 5 front power valve. J. A major Get a book on Rochester carburetors to help with the setup and get jets and metering rods at a carb shop (used). Best carburetor for 454 chevy truck reviews and buying guide 2023Best carb for 454 chevy: fueling your big block performance Amazon. 030 with closed chamber 206 heads mild cam headman shorty headers ? Street strip in mind Seriosly though, I would be thinking about a vacuum secondary Holley around 780 cfm. w/ S. Find your ride's sweet spot for power and efficiency! Calculators. The engine is a 454 ,0. Save Share 454 LS6 Carburator help. 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. com: 4 barrel mechanical carburetor for Here are the reviews of the best carburetor for the 454 Chevy truck. Any thoughts? :3gears: Mike Davis, Mar 25, 2007 #1. Mesa Corvette dual snorkel air cleaner. Original skin/int. QJets have a maximum airflow of from 750-800 cfm. This makes installation, and tuning easier. Will use again if Amazon. Any thoughts or experiences with Edelbrock carbs would be greatly appreciated. 8%. Your test with the throttle bodys is 100% irrelevant to the 4 BARREL ROCHESTER QUADRAJET MARINE CARBURETOR FOR V8 7. I'm not asking what carb I need I'm asking whats the best CFM for a stock hydraulic roller 454 with headers and full 2 1/2 in exhaust. A friend is offering to "port-match" those heads to the intake. 5 with any Edelbrock carb. 030. 00 plus shipping. Nov 27, 2024. I just found and rechecked the tag that hi guys so i have a 327 with a 600 cfm edelbrock carb on it is a old carb and needs a rebuild. The carb you have you will need to find numbers on it or measure the barrels to determine exactly what it is. i engines, 4 barrel quadrajet with manual divorced choke compatible with Corvette 1975-1979, compatible with Monte Suburban K20 Pickup Impala Carlo Nova K20 G20 1969-1973, compatible with Van El Camino Camaro Caprice C30 C50 1969 Running 10. Too little carb and the engine One way to think of it is that 100% of the 650 cfm carb fits into the 5500 rpm range, whereas only about 80% of a 750 cfm carb would fit into the same range -- the top 20% of the carb would be wasted. So a larger 750 cfm carburetor would slightly increase the airflow potential. (I keep saying its a 600 cfm but I checked the box and its really a 650) but its just a street car with rpms mainly below 6,000. . I am running a 770 cfm avenger on my zz454 . For a typical small-block engine, a 600-650 CFM carb is suitable. 86, Pump Gas, Full Exhaust (Under Frame off Rebuild) One way to think of it is that 100% of the 650 cfm So here is a quote from Carb Doctor that would support Jim is correct. If that is true, is that too much carb for 454 that will see 6000+ RPM when racing? The 454 will be used in my little Datsun 280z and will weigh around 3000 lbs w/driver after What is the correct Holley Carb. th400 HOWEVER, a smaller venturi would pick up low speed a bit. 73. 38-inch diameter venturi which is the same size venturi as the one used in the 750-cfm carburetors. 704EVER. Typically flows in the 830 cfm range. 30 over bore,with a 4. (owned since 1978!) 454-th400 3. If you are using an adapter on the Q-jet iron intake, w/a 600 cfm carb, go ahead and put the RPM on there w/the 750. 000 Carburetor: 850-cfm Holley HP or Race Demon Intake A 600 cfm holley carb on a 400 small block should run great from idle to about 5000 rpm , and good up to 6000 , but horsepower numbers will be better with a slightly lager carb , maybe 700 cfm . It ran well except for the constant tuning and after a while the carb started puking its guts on regular basis. Save up to 6% when you buy more. 4L/454 Carburetors and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase Carburetor, Marine, 650 cfm, 4-Barrel, Spread Bore, Single Inlet, Natural, Universal Style Linkage, Each. But a 650 is way to small a carb for a 454. The more HP an engine makes the more air it needs to Type: 454 Big-Block. Does anyone know what carb, right out of the box, would be best for a ZZ454/4 speed muncie? I know that GM recommends an 850cfm, but I read somewhere that a 750cfm runs better. derosnopS. any recommendations for a radiator and fan that will keep my 454 cool for moderate street driving (less than 20 miles trips and car not being on for over an hour). Our Top Pick on Amazon https://tiny Rochester quadrajet carburetor 800 CFM 454 chevrolet (#350357289284) i***i (428) - Feedback left by buyer. Brand New. Rochester Quadrajet Carburetor 4 Barrel Carburetor - Compatible with Chevy Quadrajet 1901R 4MV Chevy 66-73 Manual Divorced Choke Replace Corvettes 75-79 750 CFM Carb Chevrolet Engines 327 350 427 454 3. Fellow 454 (built) Owner here. Normally I'd say for a mild 454 a Quadrajet would fit the bill nicely. 1cr afr 265 heads comp cam hr 230/236 112lsa edelbrock airgap. 56 gears kind of skews that thinking. Took these this morning. I am looking for max HP. If you try to use a carb with less CFM than required, performance and economy may be greatly reduced. If you want better sound with stock exhaust Edelbrock 750 cfm or 600 cfm carburetor for 454 stock engine. I actually have this carb for my spare 454 that has a cam rated for a 3000 stall converter. Any Suggestions? I calculated the Formula 454*6000rpm / Most people would offer many reasons why airflow would be the restricting factor. Most are rated 750 CFM 【 Packge include】1x Carburetor, 1 x Flange Gaskets, 1x Air filter gaskets, 1x Tool for Pushing Plug, 4x Plugs, 8x Eric Christie Houston Chevelle Club 1965 El Camino - Undergoing frame off resto, build thread (2011- 1970 SS 496 - Cortez Silver, black stripes, black int, forged bottom end, ported 781s, Eddy Air Gap, ProSystem carb, Lunati cam & rockers, Sanderson headers, Vintage Air Front runner, Century Transmission - 200R4, 12 bolt, 3. There is also a 600CFM version but that won't run a 454. wmgyzfb sxdkl zkcsdwac iokpb oxk nwxj josb ekhhij hfybj hfgxu