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No answers yet? No expert, but as you surmise, measure perpedicular to the pin axis, about midway up the skirt. That's your piston OD. No different from any other piston. The pistons will grow in size slightly as they come up to operating temperature. Mahles will remain more dimensional stable compared with other brands, thus less piston slap when cold.
Measure cylinder OD at two locations: top and bottom in every direction. The bottom receives less wear. Shouldn't be too much of a difference if the cylinder is within spec.
Hope this helps,
Sherwood
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