Thanks 754, MikeR seems to think he can do it. I imagine it will involve not changing the shape or size of the ports too much, mostly cleaning up any major disruptions to smooth flow and maximize swirl,eliminating shrouding at low lift,and equalizing chamber and port size. Since the valve is only at max lift once and lower lifts twice it seems to follow that the more charge you can pack into the chamber at low lift would maximize the efficiency of the port and chamber and produce more *power* at a given RPM. This would require maximum velocity to efficiently accomplish. But the cam remains the wild card in the equation. Compression and porting must match the cam profile, I think. Am I way off base on this theory?