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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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