Ferm, i was going to order up a set of those pistons and decided to check compression with the calculator, I'm a bit concerned about the final compression. They list it as a +10cc dish, figuring 58 ccs for my vortecs, 3.48 stroke, 4.030 bore. .037 for the head gasket, .040 for the deck height. I noticed the compression height was 1.540 vs 1.560 on an older piston, so I added the extra .020 to the deck height. I ended up with 9.5-1, a little higher than I was expecting. Give me some input here, were my calculations off or will this motor run at 9.5-1(on regular gas). Thanks
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