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Piston size vs. bore

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What was it bored to?


There are 3 different sizes of OEM piston (A, B, and C).

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Your block should be marked as to what size you need. I believe A is the largest and C is the smallest.


What is the block marked? If you had C's or B's you may open up the bore to go with a larger one. Only way to know for sure is to measure run-out and taper. If that is within specs, do a LIGHT hone, re-measure and calculate piston to wall clearance before you buy pistons.

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