Amount of CFM available from 452 heads, heavily ported

And a fully ported, but not “max effort” 346 with 2.14/1.81 valves.
I believe these heads have gone 122 or 123 in the 1/4 in a full bodied Challenger running bias ply repro tires and through ex manifolds(FAST legal):

Lift———I/E
.100—- 70/56
.200—-147/112
.300—-211/152
.400—-245/188
.500—-269/204
.600—-278/211
.700—-282/215