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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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