The heads were 66.5 cc's when pulled off and measured. Heads were milled to remove about 8 cc's. The gasket is .045 crushed, not .050..and the gasket bore is 4.180 with the 8553 felpro.
Ran the nunbers through KB'S calculator and got 9.4 without figuring valve reliefs.
figuring the valve reliefs '5cc'?? would be around 8.9
Still, 42* overlap & 150 psi cranking , its just fine and doesnt turn over with more than 18* initial fully warmed up.
