It works just like I said it did. All the Q-jets with the larger primaries are NOT "800" cfm, and never have been. The factory used quite a few different stops on the secondary shaft to control CFM potential on the smaller and larger castings. So anytime you see someone post that they are using or working on an "800" cfm Q-jet it could be anywhere from around 500 cfm if it came of a 301 Pontiac clear up to "850" cfm if it came off a 1971-74 Buick 455 or 73-74 Pontiac Super Duty.......FWIW....
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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