Quote:
Originally Posted by truckster
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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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.