I suspect it has to be a Detroit Diesel 2-stroke-cycle powered tractor - and the bigger the better.
The Big Bud tractor - model 16V-747 has 1000 engine horsepower, 900 drawbar horsepower, and 1472 cubic inches. That comes to .679 of a horsepower per cubic inch. I don't know of any other tractors that high.
Some lessers ones are:
Oliver Super 99 GM with 213 c.i. 3-71 Detroit 78.7 horsepower .369 horse per c.i.
Big Deere 4-stoke is close though - Deere 8430T 548 c.i. 298 horse .543 of a horse per c.i.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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