Ive pulled apart 3 390 engines all have .40 stamped on the piston does this mean that the engine is bored out 40 over or do all 390 engines have this stamp?

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1048700

2026-03-22 08:21

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if I'm not mistaken, they are all like that(390's). The motor is the same as a 352, just a larger bore and longer stroke.

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