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Piston ID.

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It does have STD stamped on it meaning standard...I've never seen a aftermarket piston with that stamped on it so IMO I thinks its the factory piston(jus my 2cents doe)

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Its an old wiseco. Now they put a longer serial number to include the actual diameter.

Thought so, thanks just wanted to make sure before I buy ring / wristpin / circlips.    :thumbsup:

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Just put that 639ps into google and it will pop up with the new version of the same piston

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