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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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