What is the Best Pressure to use for Flow Bench Testing?

PRH said

Try not to get lost in the idea of chasing flow numbers.

Bigger flow numbers don’t always equate to higher power output.

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I am mostly curious as to never having flowed heads before and these have been worked over. I know you can mess a set up by just hogging them out without knowledge of how air flows. I do enjoy the Youtube Channel Bain Racing, he does a great job