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Lycoming piston size

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sdemeyer

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I am going through the cylinders on my 0290-d2 and am having trouble determining if they have been bored oversize. My log book says they are .010 oversize but there are no paint or other markings on the cylinders indicating that is so. The pistons have no markings, at least that I can tell, indicating oversize. The cylinders all measure 4.885 which according to the table of limits is close to the maximum diameter. The pistons measure 4.875 at the skirt. Does this sound like .010 oversize? If the pistons are marked, where would I find such markings?
 

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