Thank you for the advice will give it a shot!

In most cases it seems as though when the port in the manifold is larger than the head, there is no loss in HP. The other way around is not good. I believe it's a situation where the edge stops reversion pulses. Extrude honing is done by machine. They force a cutting medium through the port under pressure. It removes objects in it's way, so the most restrictive areas get opened up first.

Frank/Rebop

Bristol, In ( by Elkhart)