Many times when rebuilding an engine new pistons are needed. Your old ones must be worn around the edges or somewhere on them. Pistons do wear, so not, it is not uncommon to replace the pistons when doing this work. Someone else with more experience may chime in here and disagree. If someone does, listen to them.

Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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