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your avs with 630 cfm was put aside and the thermoquad with the spread bore was put in place as it was approx 800cfm. The idea was taken from G.M Rochester as when the secondary choke plate was added, more fuel flow was allowed without bogging. I have never run anything under 750 cfm with a 340

by the way rumblefish, when you buy these kits as apposed to buying a rebuild, how do you re-bush the throttle plate bores?

625cfm on a 340? Your gonna dehydrate that poor motor...