Another major factor is stroke of the motor. Longer stroke delivers more torque. Examples are the old Farmalls had very long stroke while the old Fords were much shorter, so the Fords worked at higher RPMs. Another example is two old Ford motors. The 300-6 which was long stroke and the 302 V8 which superseded it. I had a heavy built 1981 Ford E-250 with 300-6 that would pull a heavy load up steep hills pretty nicely. I traded that for 1986 E350 with a 302 V-8. That 350 with the same load would die on the hills that the older truck did well on.
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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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