I'm building this combination for a medium-weight street/drag car: 6.76 PEP rods (this gives the combo a 2:1 rod ratio), Diamond 51907 shelf pistons (flat top pistons with valve reliefs), .000" deck, Cometic C5460-036 gaskets, (or the .020" Chrysler gaskets with -.015" deck), ported 915 heads cut to 65 ccs which comes out to approx 11.4:1 static. You can play with the Wallace compression ratio calculator (I have for years) or do the long math, but their SCR calculator is pretty close, just add your specs and voila, a ballpark estimation! http://www.wallaceracing.com/cr_test2.php

Last edited by blue_stocker; 08/29/23 03:33 PM.
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