Small Block Cylinder Heads 'Stock Specs'

The 'Combustion Chamber' CC's measurements seem to bounce around
a lot on the Small Block Mopar Heads.

I have a #2658920 Head {untouched} that measured at 62.6 CC's, and another
#2658920 Head {untouched} that measured at 65.1 CC's.

As per the normal milling procedure, .0065" has to be 'milled' off the Head to
reduce 1 CC level.