FWIW here's what pettis did to my valves.

Intakes Margin .060
Seat 45* x .070
BC/BA 32* x .070/12*

Exhaust Margin .080
Seat 45* x .085
BC/BA 36*x .050/15* Not a machinist and not 100% on this stuff so maybe someone can educate us here.....


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....