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do you run 12:1 on pump gas??
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yes, 93. electronics cover a multitude of sins.
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The ID is tapered - lighter
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yes, thats why i posted the 2 pistons side by side, look at the normal wristpin on the 2.7 and compare to the tapered RSR pin, grams are critical on these components. Same w/ the valves 993RS are much lighter( and bigger) than 3.2 or 964 or any of the earlier valves.