Speedmaster Flow Limits

Earlie A said

I agree, and I’ll never be able to make that distinction on the flow bench. Plenty of people with success with both the 45 and 50 degree seats. I have learned that a top cut angle of 5-10 degrees less than the seat angle helps flow in the mid to high lift zones while marginally hurting low lift flow. It also helps keep the short side flowing a little longer.

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That top cut that’s killing low lift flow is making more power than it’s losing.

That’s a place where the bench is lying to you. Most guys would spend too much time trying to get those back.

Under .200 lift it really doesn’t matter. You can’t wreck the seat or port to kill low lift flow, but doing a quality valve job that hurts low lift flow isn’t bad.

In fact, if you want to humor yourself flow the low lift at as high a pressure as you can. Do the mid lift flowing at 28 and the high lift at 10 inches and see what you find.