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What's my compression ratio?2cub49 04-07-2006, 07:28 PM I recently installed Summit Trickflow heads with 62cc chambers. I'm not sure if my old 97 stock heads had 54 or 58 cc chambers. Anyone know what cc's the old heads were and what my compression ratio now is? NC-LT1 04-07-2006, 08:06 PM ~54cc's if nothing else has changed, ie.. using a felpro 1074 gasket which has a .039" compressed thickness Vs. the stock LT1 gm gasket which is thicker..at .049" 4.00" bore 3.48" stroke .039" compressed thickness 4.125 gasket diamter 62cc chamber head -6.3 cc valve piston 9.025" deck = 9.74 : 1 SCR 4.00" bore 3.48" stroke .049" compressed thickness 4.125 gasket diamter 62cc chamber head -6.3 cc valve piston 9.025" deck = 9.51 : 1 2cub49 04-07-2006, 08:51 PM Great, either way that's a good compression ratio for a S/C engine. I'll have to ask my mechanic which head gaskets he used. Car really goes and no pinging even with the Casper TP Enhancer which used to give me a little pinging with Ion's tune. Thanks | ||