Note in the specs that the early model tested at Nebraska had a 1" carburetor and put out about 13 hp on the drawbar. Later models had a 1.25" carb. I spent a lot of time on F-20s and a '29 Regular back in the 40s and I really don't think there was much difference in their power. I expect the larger venturi accounts for the extra power. Early IHC ads made a point of emphasizing the "extra power" of the F-20 (I think they claimed "about 15%," but I haven't seen one of these ads in years). Still, I am pretty sure they were comparing the 20 with the very early Farmall. Good advertising, but I suspect they knew what they were doing.
Another little factoid. Early IHC ads for the F-20 refer to the "original Farmall." In one place, I remember seeing "the regular Farmall," which was not really a name but a way of distinguishing the two tractors. I believe the unofficial name "Regular" came from the difficulty of telling the Farmall and the F-20 apart at a distance (unless you had very sharp eyes and could spot the exhaust pipe coming out the top on the F-20, as well as the different steering gear). I have actually heard someone ask "Is that an F-20 or just a regular Farmall." Everyone understood that "regular" meant "the original model." I can't prove what I am stating here. It's just an opinion from an old geezer who lived and breathed these beasts for ten years or so way back then.
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