On page 6 of my original 656 Operator's manual the Fuel System section for gasoline engines states "Use clean fuel having a minimum octane rating of 93 (research method). It has also been discussed on this forum numerous times and using fuel of a lesser rating in the IHC six cylinder engines can lead to engine damage from pre-ignition. Sure it is somewhat of an inconvenience and I have a separate tank and haul it from town in a 100 gallon tank and fill the tractor from my pick-up. I have never used the tractor for any tillage work so fuel usage hasn't been that much of a real issue. I would rather error on the side of caution instead of destroying a really good tractor and engine. You may be just lucky or have your tractor detuned for the 87 octane fuel you are using but luck usually isn't my friend and I'm not a gambler, Hal.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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