mark: Your post didn't need dumbing down, tractor pulling has never proved anything except some folks have more cash than they know what to do with. To start with I never suggested anyone actually ever used a 20,000 lb 560 in the field. What I did say was, no short term hard pull ever messed up a power train on a tractor. Heat buildup over the long haul, my friend is the ture test of a powertrain. IH put together the 560 basically using Farmall M rear end and placed 15 + more hp up front. Many 560 diesels turned out 75 hp right from the factory, and it was quite easy to crank 90 hp out of one, thus there were many 560s out in the field turning twice the hp the Farmall M rearend was designed for. I expect the 16 hour days would decrease the TIME between engine overhauls. A lot of folks running 16 hour days quite easily put 600 to a 1000 hours a year on tractors. Now, if a tractor puller went to a 150 pulls per year, we're talking less than 10 hours per year of tractor operation. Given the fact it is quite easy to get 10,000 hours tractor operation between engine rebuilds, on the farm. By my count a tractor puller should get a 1,000 years between engine rebuilds.
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