Slightly strange head flow question.

Ok thanks all-

So to summarise -

If I understand correctly - if the cam can't take advantage of the peak flow of the head, there's little likelyhood of seeing any improvement, and it may go backwards due to a drop in velocity.

I also undertand the point about "averaging" the flow rate across the lift in order to determine the likely HP improvements -


BUT - is there a simple formula or theory that will give an idea of the target peak Head flow for a certain cam/combo?

I suppose I could have saved a lot of this by asking "How does a builder/head porter know when the head flows enough for the combo?"

1Wild mentioned formulas - do they apply to this issue?