280-290 ish cfm is a reasonable goal since it's proven ability of the overall stock structure, no reason not to cast a port the shape of a ported head even if there's no real growth room it's enough for 90% of us but would be nice if porting and larger valves could gain 10-15% + cfm, you could always sell thats in a cnc option. it would be nice if they had the best chamber design available since what I've heard the ones we got offer a fairly generic design.