Slightly strange head flow question.

Rat Patrol said

So in my combo - I need to keep a close eye on the flow values upt to .550, but above that is irrelevant...yes?

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This is the only thing you need to concern yourself with if comparing the same two heds and ports. You also need to do the empirical measuring to get lift at the valve, and then take some more lift off for the short duration it sees at max lift.