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To give an idea of how hard it is to get decent compression in a 383 with a piston that gives true zero deck height, a .039 gasket & a chamber volume of 84cc you'll have right at 9.5-1 C/R & you really need a small valve notch which would drop the C/R down to 9.25.... And with aluminum heads & good quench you really want to be at 10.5+ ........... To get there with 4cc valve notches in the pistons would require cutting the chamber volume to 70cc... The short stroke makes chamber volume critical... Another reason why guys build strokers..



If you're spending money on heads for this combo, the Brodix B1BS has 65-66cc chambers with a very good design that will net you some compression with zero deck. Last i checked they were around a couple grand a pair... not much more than the Edelbrocks, and a way better head overall...