[jdean]

ADR....i agree the "bigger" recipe does not always deliver when it comes to intake or exhaust flow. With both valves, ports and runners, it is the shape and the coordination of all components that make power.

An example is the Vortec SBC head. It has smaller valves and runners than about any other performance SBC head, but it performs better than bigger ones costing twice as much - it's all about shape!