QJet CFM

brent covey

New member
Jul 2, 1999
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QuadraJets are big suckers-

They're 700-800 cfm, however this is a function of the size of the primary
bores, theres little tricks GM used to restrict them a bit for some
combinations, like only allowing partial opening etc.

Think BIG

600 CFM is plenty on a 455 in round terms, but more is well, more!

One of the smart V8 engine dudes here will know, Steve F or Rick S likely
has the lowdown on the exact figures-

I understand the Cadillac FI in 1975-1976 on the 8.2 litre is *1000* cfm!

Brent Covey
(lowly Corvair mechanic with so few cfm they can be counted on fingers)
Vancouver BC