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Originally Posted by Kev70ss  I'm using a virtual engine calculator, but I keep getting I different number form you guys can you tell me if i made a mistake somewhere? I entered 4.060 for the bore size 3.48 for the stroke and for the head volume i took the 64cc and added 6cc for the valve reliefs on the pistons and 4cc for the gasket. Then for the gasket bore I used a 4.1 inch and the last criteria was gasket+deck in inches. I wasnt sure about that one so i entered the gasket thickness of 0.018 and I keep coming up with 10.47comp, can you tell me if I messed up somewhere? |
Everything looks good with 2 exceptions. The valve reliefs are most likely a little bit bigger, maybe 7-8cc's. The big number you left out is how far down the pistons are in the bore. Unless the block has been decked, they are probably .020"-.025" down in the hole and most standard head gaskets are around .040". That'll give you .060"-.065" for the entry you were not sure about. Punch those numbers in and you should come up with somewhere around 9.6 or 9.7:1.