Replacement Valve Seats

pittsburghracer said

I’ve never bought the cnc heads nor never will but the stock head can be hand ported to flow 290cfm with their 2.02 valves.

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That's about what I have found. I've hit 290 with 45 degree seats and 294 with 50 degree seats, but that's with clay in the chamber, so I guess it's cheating. My ports are also not that stable beyond 500 lift, so I have work to do.