It seems like every performace s6 build uses oversized valves, my theory on the subject (just a theory) is that big valves in a slant might actually hinder performance due to the small bore size. Even with a bore notch to unshroud the valve 1/3 of the valve is crammed up against the cyl wall blocking air flow. Also the bigger the valve the more of an obstuction it becomes to air flow into the cyl.
Has anyone ever put a slant 6 head on a flow bench and did a before and after test with stock valves vs oversized?
What are your thoughts on this?
