Since many parts between Farmall Regulars and Farmall F-20's are easily interchangeable, the absolute best way to tell the difference is by serial numbers. Farmall Regulars used QC as the prefix until Oct 1926 when IHC moved production from Tractor Works in Chicago to Farmall Works in Moline. T was then used. Even after the move all engine blocks continued to used the QC prefix. The left frame rail wasn't stamped with a serial number until early 1927 which was located just behind the radiator and only for a short period of time. It was then moved aft near the clutch housing. All Regulars had a tag mounted on the tool box using 2 rivets. And this continued onto the F-20 until the end of 1932 when 4 rivets were then used to secure the tag. Tractor identification on the serial tag also changed at the same time. I believe IHC made effort to make sure serial numbers matched. It is hard to find tractors without matching numbers, but they exist. Casting codes started on the Farmall F-30 in 1931 and no Regular has them.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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