Originally Posted by Colin91Z

I ended up not using cometics...but the part # that I was going to use was C5645-036. Those are 4.04 bore, .036 thick. Those work if you have stock castings with 2.00/1.57s, but if you have large valve heads you would need the 4.100 bore gaskets which are C5646-036

The reasons that I didn't use them is because later I measured and found that my pistons were all .005-.006 in the hole, and also that the finish on the deck surface of my block was not smooth enough for cometics to seal properly. So I went with GM Impala SS gaskets which gave me the same CR with a .034 quech.

Originally Posted by SS MPSTR

Thanks for the information.