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Conventional Late Model Stock rules don’t specifically limit compression. Instead, they require flat-top pistons and have a minimum volume for the combustion chamber. Compression equals power, so to maximize it, make sure the valve pockets in the piston tops are no larger than necessary and that the combustion chambers are all right at the minimum size (normally 62 cc’s). If you get much variation after cc’ing the combustion chambers, you can sometimes deck the head so that the smallest chamber is slightly undersized to bring the larger chambers closer to the minimum and then dish the valves on a lathe to open the smallest chamber back up a bit.