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Old 02-04-2013, 10:34 PM
cdminter59 cdminter59 is offline
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Chevy 383 Roller Build (cont.....)

Unless you tell the machinist to mill the deck he won't if he don't have the crank, rod, and pistons. The kits listed tell you the compression ratio with the cc of the head chamber. There is no such animal as a 10.0 compression piston. You get the piston head volume from the manufacturers website and enter it in the C.R. calculator. Also the head chamber cc, gasket compressed thickness, gasket diameter, cylinder bore diameter, deck clearance, stroke, and rod length. It takes all of these measurements to figure static compression ratio. For an example if you have 64cc heads, 12cc piston head volume, .040 compressed gasket thickness, 4.166 gasket diameter, 4.030 cylinder bore, 0 deck clearance, 3.75 stroke and 6.0 rod length = 10.232 C.R. If you have .025 deck clearance, .015 gasket thickness, and a 12cc piston with everything else the same = 10.272 C.R. Just change pistons to a 18cc piston, 0 deck clearance and .040 compressed gasket thickness = 9.623 C.R. Change the deck clearance to .025 and a .015 compressed gasket thickness = 9.658 C.R. I used 0 deck clearance and .040 compressed gasket thickness to have a .040 quench. Same for .025 and .015 = .040 quench.
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