Speedmaster Small block porting tips and results Part 1

After that test I added a 30 degree and 15 degree cut to the factory 60 and 30 seat cuts from the factory. I then widened the .930 measurement at the pushrod pinch to the 1.015 measurements given to me from the cnc’d heads from Speedmaster. I then removed the slight overhang right before the seat on the shortside. I then took a 40 grit sanding roll to the whole port and mounted it for my second flow test. Before and after number side by side.
Before—————-after
.100——55——————65
.200——131—————137
.300——185—————-194
.400——235—————-240
.450——247
.500——240—————250
.600——246—————265
.700——256-262———263

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