Originally Posted by Steeveedee (Post 8217449)

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/

Originally Posted by harpo231 (Post 8217430)

650 for stock

Originally Posted by Problems (Post 8217556)

Cliff is “the” guy for quadrajets, he literally wrote the book on high performance modifications. but he can get pretty far behind if you want him to build a custom one. Last year about this time he told me he had a 6 month wait, everyone sends him stuff as spring gets near. I didn’t have that kind of time so I tried quadrajetpower out of Texas, after a couple of long conversations with them. they built a 800 cfm that’s on a 467 Pontiac in my wife’s 69’ firebird. I wouldn’t hesitate to go with them again, they did a nice job.

Originally Posted by truckster (Post 8217559)

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.

Originally Posted by mike16 (Post 8218386)

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 Wiggles does new. Roe's book covers an enourmous amount on the Q-Jets including alot more on mods than wiggle'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 wiggles book for less than 8 dollars while Roe's book, 35 years later sells for about 20 dollars. It is truly the diffinitive source.

Originally Posted by Steeveedee (Post 8218484)

The price of a book means little for the value received. I've bought many new books for less than used books, on Amazon. Can you point me to a failure on the part of either author on making a recommendation of carburetor work? Have you made a "better mileage or best of drags ever with a Q-Jet" comparison? Please let me know.

Originally Posted by mike16 (Post 8219232)

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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 Cliffy'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.

Originally Posted by brown7373 (Post 8219389)

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!

Originally Posted by leddzepp (Post 8219678)

Who are Ruggles and Roe? :lol:

Bob Stone is the man when is comes to Q-Jets :metal:

Originally Posted by truckster (Post 8217559)

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.

Originally Posted by truckster (Post 8217559)

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.

Originally Posted by HO455 (Post 8219718)

Well technically that isn't true. Due to internal GM rules and issues there were Quadrajets that left the factory as 650 cfm units. Most notably the 400 ci first gen Firebirds. The exact engine in a GTO made 350 HP but in the Firebird it made 335 HP. The carburetor was the same on both engines with the exception that the secondary throttle shaft was limited to prevent full throttle. So yes both throttle bodies were capable of 750 cfm but unless you modified the secondarys you wouldn't be getting 750 CFM. There are more strange exceptions but none of the are very common. Like a Q-jets on 230 ci engines. To run them on these small cubic inch engines there are physical internal differences from the large cubic inch engine carbs that relate to idle quality and low rpm throttle response. It is easier to find a carb that started life on a similar sized engine unless you are aware of the challenges you are facing. In your case the 800 cfm units came on 454's from the factory. In fact I believe it is the most common application of the 800.

Originally Posted by 67_C-30 (Post 8219834)

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.