L92--LS3 Compression Difference
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L92--LS3 Compression Difference
Does anyone know what GM did different to raise compression from 10.5 on the L92 to 10.7 on the LS3? Different head gasket, pistons or chamber volume? Head gasket would be the easiest and cheapest. I've read it has a different head casting #, so maybe that's it.
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I hadn't thought about the valves, but the difference is small. I get 1.7 cc's or about .008 thinner gasket. Do the L92 pistons have valve reliefs or are they flat tops? Maybe someone from SDPC can check to see if the LS3 has the same part no. gasket as the L92 and the piston differences. Using a thinner mls gasket would be good.
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Originally Posted by drain89
from the pic I have of the ls3, it doesn't have valve reliefs. the l92 has them. I still would like to know the thickness of the head gaskets.