Many things are important. But, with a used gas engine, ring grooves in the pistons are often the first thing to get worn, and often the most common to be overlooked. In a diesel, even worse - unless they are Plasma-Keystone rings. Cylinder taper is also important, since it causes excess ring movement in those piston grooves. Scores in the cylinder walls are also a problem. As to clearance? Yes, but I'd stick it at the bottom of my list. Much of that depends on if you've got aluminum cam-ground pistons, or older split-skirt pistons.
Years back we used to "rebuild" old pistons, #1 by knurling the skirts to make them fit tighter, and #2 by recutting the grooves and adding repair shims. I still do it on engines I can't find new parts for - OR if the new parts are super expensive.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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