Comparing the F150 to a Farmall, if the F150 were a 4x4 with low range, and you could put the power to the ground, it could easily pull as much or more than the Farmall.
But looking at the big picture, it couldn't do it over and over or pull the same load all day, day after day. It would soon stress the engine, frame, suspension, and drive train to the breaking point.
As for engine differences, an automotive engine is typically a high compression, short stroke, big bore, big valves, lots of valve overlap, light flywheel, light block, gets it's best power up around 6000 RPM, and rarely runs in that range. Good thing too, cause it wouldn't last long doing that!
A tractor, or industrial engine is low compression, long stroke, small bore, small valves, very little valve overlap, heavy flywheel, heavy block, gets it's best power around 1500 RPM, and is designed and governed to do that for many, many hours under the worst of conditions. Then rebuild it, and do it again!
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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