[Stan Weiss]

Originally Posted by 25stevem

As posted your no where near 9.4 to one compression.

I come up with 8.57 to 1 by these numbers.
6X heads with valve job and milled .020"= 91.67 CCs.
Head gasket = 9.7CCs
Piston notch volume ( assuming 4 notches) =6.7 CCs
.010 deck clearance = .1352 CCs <<<< 2.217 cc's
Ring land volume= 1.5 CCs
Cylinder Bore @ .030" over=51.72 cid, converted to CCs=831.1 CCs
With this I assumed no Intake valve chamfers in the top of the Bore which at .030"would still be atleast 2 CCs.

You need to pick your Cam with this compression ratio in mind.

Steve,
Using your numbers with correction shown above I get 8.436:1

Stan