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These Fel-Pro 1004 head gaskets have 4.190-inch bore openings and a compressed thickness of .041 inch and a volume of 9.2 cc. They feature a pre-flattened steel wire seal that keeps a tight seal, even on a high-compression engine like this one. The final compression ratio with our combination of pistons, cylinder heads, and gasket is 10.8:1. With our cam profile and aluminum heads, detonation on the street won’t be a problem as long as we run 91 or better octane.