What planet are we on?

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.