Someone help me out here...the only Mopar 452 heads with which I am familiar are cast iron stockers from the late '70s, usually 90 - 92 cc chambers.
I've never associated that number with aluminum heads.
If the refrigerator magnet sticks to them they are cast iron. In that case 9.30:1 is a very usable compression ratio for pump gas.
R.
EARTH ...
MP sells an NHRA stock legal head called the 452 , it's an Ebrock head with straight plugs and a freeze plug in the slab ended head. Since NHRA was allowing outer makes to use it in stock they finally allowed Mopar one also.
