1969 Road Runner Project, Part IV
Another critical measurement is the deck height spec. The zero deck height of the 542 engine, when combined with the 40cc reverse dome piston, CNC-ported 78cc chamber, and .042-inch thick gasket calculated to a compression ratio of 9.5:1. In stock displacements (383/400/426/440), this could be as low as a 6:1 ratio, but keep in mind that this 542 has an additional 100 cubic inches.
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