I am not too sure about the casting codes and dates, but differentiating between the Regular and F-20 is pretty easy and straightforward.
1. Regs used an open geared steering atop the bolster, whereas the F-20 was enclosed and running in oil.
2. Except for the earliest F-20s, the rear end housing had small ridges cast into the top on either side of the differential. Sort of foot rest things. Regulars never had these ridges.
Outside of checking the serial number, the above two items are pretty much clinchers. The other differences listed below are items that were not on original tractors, but may have been added at a later date:
1. Regulars had the exhaust point down and out to just above the left frame rail. F-20s had the exhaust go through the hood.
2. The F-20 air cleaner inlet pipe was taller than the Regular.
3. The starting gas tank on the F-20 was inside the main fuel tank, whereas thr regular had the tank mounted on a bracket at the rear of the fuel tank.
4. A large number of the Regulars had a simple leaf spring that the seat attached to. When several operators were injured when the spring broke, IH went to a coil spring with a hot rolled plain steel bar. All the F-20s used the newer type of seat springs. Later production Regulars had seat srpings like the F-20s.
5. Regulars never had rubber tires originally. The later F-20s often came from the factory on rubber.
6. Regulars never came with brake pedals, just a brake lever that actuated the left wheel.
If I remember correctly, the earliest Regulars did not have an air cleaner as we know it. The air inlet went directly through the hood and was topped by a small round frame that was covered with cloth. The exhaust also went through the hood. The earliest Regulars had a round governor housing, whereas the later units had the familiar rectangular one. The first magnetos were Dixie units. By around 1926 or so, these were replaced with International's own E4A mag.
The serial number is your best bet in identification. Large numbers of Regulars had their magnetos, carbs., intake/exhaust manifolds, and even gas tanks changed to F-20 units. The steel wheels were often cut down and converted to rubber, or replaced entirely with F-20 wheels.
If I have anything wrong here, or missing other points of difference, I am sure that the forum gurus will pipe in. I welcome their input and corrections.
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