If you go to the Stan Weiss site under the Pontiac listing you will see flow numbers I supplied to him many years ago on a 191 casting that all I did was apply a 3 angle valve job with a very deep 60 bottom cut , the OD of the 30 seat was maxed out, and the 15 top cut was intentionally held to .025"
The numbers at .200" and .300" are substantial!
Flow@28"
.100". 88
.200" 160
.300" 199
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