'1967' 440/375 HP and 440/350 HP Comparison

oldmopardude said
it sounds tight with the HP pistons. any suggestions?

What do you mean tight? If your pistons are at zero and even with the top of the deck the felpro better HP gasket will be about .039 compressed which is perfect quench!! I wish mopar just used the 915 chamber instead of the poor open chamber design.