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The chambers will be shaved to 63 cc to produce approximately 11.75:1 compression ratio. Isn't that high for 92 octane? With the aluminum heads and carefully-prepped combustion surfaces, Joe claims he can do it without detonation. This is exactly the kind of limit pushing we expect to see plenty of in the Challenge, and if it's possible to push a street engine hard with high compression on pump gas, you'll see it here.