jeff: A 1950 Super A would have had block part number 251069 R1 from the factory. Farmall C would have also had that block. All 251069 R1 blocks had 3" bore and were C-113 engines, as they came from factory. All Super C tractors were equipped with block part number 354898 R1 from the factory. 3-1/8" bore making a C-123 engine.
Super A tractors after serial number 310300 used block number 354898 R1 from factory, but were equipped with thicker sleeves giving a 3" bore and still a C-113 engine.
An interesting side note on block number 354898 R1, it can be equipped with 3", 3-1/8" or 3-1/4" bore without any alteration to the block. Basically 3 different size sleeve and piston kits fit one block. These blocks will all interchange to fit any Farmalls A, SA, C and SC, bolt up pattern and dimencions are all the same.
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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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