Head machined at Pro1RacingHeads out of Phoenix

Pro1RacingHeads out of Phoenix. Machines his own non-beryllium valve seats out of Mold Star 90 stock and valve guides from a nickle-bronze alloy. He doesn't cut the valve seat but uses a Haas machine to profile them. He does porting and verifies his work with a flow bench.

Haven't noticed much change on the bottom end but did not loose anything. Head starts to shine mid-range and above!


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