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The first thing we did with the RPM short-block was use our Powerhouse dial indicator and deck bridge to determine the piston deck height so we could calculate the compression ratio. The deck height varied from cylinder to cylinder due to the use of several rod castings-Chrysler wasn't known for killer production tolerances, anyway-but the average was 0.100 in the hole. Combine that with the 11cc dishes in the pistons, 0.041-inch-thick head gaskets, and 75cc chambers, and it's easy to see that a 360's compression can be as hideously low as 7.5:1. View Related Article
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