Why would low lift head flow hurt power?

92b said
Why don't you use a back cut on the intake valve and is that for certain applications or across the board?

I agree with MO and almost never do a back cut on either valve.

It promotes reversion. So what looks good for flow numbers hurts power.

If you live and die by flow numbers then you do things like back cuts, no or very narrow top cuts and such to make the flow higher.