Small Block Cylinder Heads 'Stock Specs'

66fs said

Chrysler says .0053 of an inch to reduce 1 cc of chamber volume on 273 / 318. heads. I remember being impressed at how dead on that was.

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I believe that is for the 1968 and later 'open chamber' 273/318 Cylinder Heads.

1967 and earlier [Heart-Shaped/Closed Chamber} Cylinder Heads require
a 'smidge' more removal to reduce 1 CC level.