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We found the piston's deck to be at -.030 inch with the flat-top pistons, which will provide a compression ratio in the 10:1 range with a set of 72cc heads, or 11:1 with 64cc heads. We plan on assembling our long-block with Dart's Pro 1 64cc head (200cc runner volume), which will put us right at the limit for pump gas. View Related Article
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