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 The 300-6 which was long stroke and the 302 V8 which superseded it.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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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