I'll second a leak down test. Over-reving some Ford truck V-8s could crack the pistons across a ring groove.
Twenty years ago I had an '86 F150 with a 351 4 BBL that kept testing high on hydrocarbon emissions. The miles were around 105,000. I tried a tune up and the other easy fixes but they did not work. A Ford dealer could not fix it either, but in those days a $150 repair bill was enough that Minneapolis would let you keep driving it without passing their emissions test.
It kept getting worst and I left it with a small auto shop that had a reputation for good work. While the mechanic was warming it up there was a loud bang and the engine locked up. The top of one piston separated. I felt fortunate not to be driving it down the highway when it let go. The heads and crankshaft were still OK. I had the option to fix just the one cylinder, but did not trust the other seven pistons to hold up too much longer. At that time a rebuilt engine cost about what the 4WD pickup was worth after fixing it. In hind-sight, I should have sold the truck for salvage value without fixing it.
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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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