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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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