BBC Casting 241 OVAL PORT Stage IV "Valve Job and enlargemant" part 7

This gets into the custom work done by Stones to get a perfect concentric valve job and how to enlarge the seats without damaging the stones by porting the bowls to the bottom valve angle of the stock head. Time is spent showing the bottom 60 or 70 degree cuts and how to measure widths of the bottom angle to begin the "Math Scribe" showing where to cut the bowls AFTER the valve job is done...   www.headbytes.com 615-212-7168

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