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#1 |
Registered User
Join Date: Jul 2017
Location: calabash n.c
Posts: 12
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cfm quadrajet?
i need to buy a new quadrajet to replace one that is cracked and old.I found an 800cfm quad at a good price.My question I have a stock 454 out of a p3o with headers.I have no ideal what was done during rebuild 5000 miles ago but motor seem's to be stock.numbers on bad carb. are 17080212. Is a 800cfm. a good choice. Also turbo350 trans,373 rear in truck. RON
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#2 |
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Join Date: Nov 2014
Location: Lincoln City DE
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Re: cfm quadrajet?
650 for stock
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#3 |
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Re: cfm quadrajet?
Big inch Pontiacs have been fitted with 800 CFM Q-Jets. Your 454 counts as big inch. If it were up to me, I'd be calling Cliff Ruggles for information. The removal of some of the venturi material to accomplish that kind of air flow makes these carbs a little touchy to make idle right.
https://cliffshighperformance.com/
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#4 | |
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Join Date: Feb 2018
Location: Waterford, Wi
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Re: cfm quadrajet?
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#5 | |
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Re: cfm quadrajet?
Quote:
Yes, Mark is another good source for Q-Jets. I'm going to have to say that I've never seen a 283 with a Q-Jet, though. I HAVE seen them with 4GC Rochesters. Whether you go with Mark or Cliff, make sure to give them the number off the side of the carburetor as well as the intended application, which includes cam, trans, etc., if you buy a kit. You might try Ken at Everyday Performance as well; depending on where you live, he might be closer. I rebuild my own, though. There are many parts in a carburetor that aren't in a regular kit, like the cam that pulls the secondary metering rods out of the jets when the secondary air valve opens. Cliff's kits supplies them, but I haven't bought kits from Mark or Ken, so I can't say one way or the other, with them.
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#6 |
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Location: Orem, Utah
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Re: cfm quadrajet?
All Quadrajets were rated a minimum of 750 CFM; there are no 650 CFM Quadrajets.
The Quadrajet will work on almost any size motor because of the way it is designed. GM used them on engines from 283 cubic inches to high-performance 455s and Cadillac 500 cubic inch engines. As long as it's in good shape, that carb should work fine on your 454.
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#7 | |
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Join Date: Jan 2005
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Re: cfm quadrajet?
Quote:
The stock carb on a '83 Z28 with a boat anchor 305 is 800 cfm. In the late 70's most quadrajets being made were 800cfm carbs, but the metering for smog and emissions control made them less desirable carbs. Like truckster said, don't get too hung up max cfm. A stock peanut port 454 isn't going to need the full 750 or 800. The earlier non emissions 750's are fine for most engines 95% of the time. The straight inlet early 70's Buick 755 carbs are great if you happen to find on, but they need the throttle bracket changed up if you running an auto trans. For s stock or mild 454 you'd be better off looking for a early 70's 402 or a early to mid 70's 454 carb if you just want to put a kit in it and run it. They will be metered pretty close to what you want as they are.
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#8 | |
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Re: cfm quadrajet?
Quote:
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 Last edited by HO455; 03-23-2018 at 03:45 PM. Reason: -2 grammar |
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#9 | |
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Re: cfm quadrajet?
Quote:
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#10 |
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Re: cfm quadrajet?
Again, the majority of Q-jets, on most everything made after 1976 was M4M casting 800 cfm carbs. Most carbs on everything after 1976 had the same 1 7/32" primaries as the Super Duty 455 carbs from '73-74. 800 cfm Q-jets are not rare or uncommon by any stretch. The HP versions are, not an 800 cfm capable CFM carb.
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#11 | |
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#12 |
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Re: cfm quadrajet?
and buicks from the early 70's
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#13 |
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New internal kit will get you there
....new jets, rods, spring, float etc. This upgrade will give you greater flow for the bigger cubes. Coley
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#14 |
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Re: cfm quadrajet?
Cliff did not write "the book". Doug Roe wrote "the book" back in '81. and it has gone through several editions. Doug Roe's book, "used", sells for more than Ruggles does new. Roe's book covers an enourmous amount on the Q-Jets including alot more on mods than Ruggle's does and he research it himself. If your going to build a Q-Jet Roe's book is still hands down the best origonal source. I bought a new copy of Ruggles book for less than 8 dollars while Roe's book, 35 years later sells for about 20 dollars. It is truly the diffinitive source.
Last edited by old Rusty C10; 03-23-2018 at 03:52 PM. |
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#15 | |
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Re: cfm quadrajet?
Quote:
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#16 | |
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Re: cfm quadrajet?
Quote:
I have not made a better mileage or best of drags ever with a q jet comparison. why reinvent the wheel. It does not increase credability do do what others have already done, unless your audience does not know that. Thats why Roes book remains the best source on the Q Jet. But I do make choices based on moral and ethical grounds. Does that Count? I have a Dyno App so I could have lied and say yes I did. It does not take more than a few questions to find out if someone is fibbing. Hands down Roe's book is the better value. think about it.... a 35 year old used book on the subject going for more than a new one. The old one covers alot more. And ultimatley.... I'm giving credit where credit is due. It avoids the issue of plagerism if you can reference your sources. But standards vary. No Chewing Gum or pencils. But now that the word is out on Roe's book. I'll buy a few and watch their prices rise. all kidding aside it was stated that Cliff's book was "the book". It is not. Roe's was, is, and always will be. I like to set the two side by side and let others make an informed choice. Last edited by old Rusty C10; 03-23-2018 at 03:53 PM. |
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#17 | |
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Re: cfm quadrajet?
Quote:
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#18 |
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Join Date: Jun 2003
Location: Mtn. Home, Idaho
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Re: cfm quadrajet?
I've used SMI Sean Murphy Induction and was very happy with the carb. He worked for the "Carb Shop" before opening his own
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#19 |
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Join Date: Mar 2013
Location: Campbellsville, KY
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Re: cfm quadrajet?
The Quadrajet was only made in 2 CFM's: 750 and 800. The vacuum secondaries make it, in a way, a variable CFM carb. because when adjusted properly the secondaries only open as far as engine vacuum will pull them open. Many factory small blocks came with Q-jets - 650 is a good minimum for a stock big block but when speaking of a Q-jet it won't be "too much".
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#20 |
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Re: cfm quadrajet?
I have both books and use them both. As truckster mentioned, you can call and talk with Cliff. You can discuss anything and everything about your carb issues or questions. And, he can supply complete quality parts and rebuild kits, which run circles around generic parts store kits. Do they cost more? Yep, but I have found they are WELL WORTH IT!
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#21 | |
I have a radical idea!
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Re: cfm quadrajet?
Quote:
I can't say which guy is the best, but I can say if you go to any BOP event that has drag racing it's amazing to see how fast some of the cars are with Cliff's Q-jets.
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#22 |
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Re: cfm quadrajet?
Who are Ruggles and Roe?
![]() Bob Stone is the man when is comes to Q-Jets ![]()
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#23 | |
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Re: cfm quadrajet?
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#24 |
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Re: cfm quadrajet?
lets not get into name calling here this thread is a good source of info and in some instances user opinion of which we all have one, and one is not to be bashed for theirs
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#25 | |
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Re: cfm quadrajet?
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