I read somewhere about some very good cfm numbers with slight shaping of the boss and wondered what the most that can be squeezed out of the stock head with slight modifications? I am also curious about cfm changes with respect to increases in compression ratio as well as what the volumetric efficiency would be of certain modifications like intakes-headers-and mild porting. Ive actually plugged in some numbers for VE into a CFM calculator for carb flow and got 300cfm at 3000rpms for a 292 at 85%VE but am not quite sure what the VE for a mildly worked 292 would be?
