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I have two pistons from two different cars. Both pistons measure, with calipers, about 3.470 and both cylinders measure 3.50. What do the markings tell us on the top of the piston? Both have a small mark, like a proof mark, that looks like a closed horse shoe shaped circle with a line running long way through the center. One has a large 51 stamped on it and a smaller .0015. The other has a large 50 stamped on it with a smaller .0025 and between those the two stamping sizes is the number 3 in a heaver stamp. This one is out of number three cylinder so could this be a stamp the mechanic used to identify which cylinder it belonged to?

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