SM Head Modifications on a budget

pittsburghracer said

I kinda lose interest when the clay makes its first appearance. A 280-330 cfm Speedmaster needs less material, not more.

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Touche. But a 260 cfm port like this needs some fill material. If I was grinding on a port and removed 4 cc of metal and my flow was basically unchanged, I would say that was a terrible porting mistake. I just put that metal back with clay.