Pistons were .026” above deck as block surface was milled .008”
With a 68 cc combustion chamber volume static compression ratio was 9.8 to 1.
I know claimed compression ratio on a factory ‘69 340 is 10.5 to 1 with 63 CC’s combustion chamber volume, but my virgin ‘69 X heads measured combustion chamber volumes at 75 CC’s.
I had the heads milled .024” to bring the chamber volume down to 68 CC’s.
