The main problem is the cast aluminum pistons that are only availiable for rebuilding these engines nowadays. When they were first manufactured IH used forged pistons. If you know anything about motors you know forged pistons are alot more consistent when they heat up. I have a 263 706. If I use it for light work on 87 its fine, but if I would run it hard say at 90% load on 87 the cast pistons would swell and score cylinders, BTDT! 87 octane burns fast creating allot of heat in the piston, more than it can get rid of causing it to swell. 93 octane burns much slower and cooler. If you don't believe the Vet get an IH 6 cylinder gasser hook it to a plow, put in 87 and go to work. I guarantee you will be hearing all kinds of strange noises as the cast pistons start transferring metal within a few hours..
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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