Would agree that the 1950 is original. Think your other block with C 248 on it is the same bore size without sleeves installed as a stock M block. Ones I find that have C 248 on block and a bore size without sleeves installed that is the same as C 264 or C 281 blocks are cast number 365586 R91, if not ground off. All of these I have noticed were cast in sixties, but since there not that common I'm not sure about start dates. Also found some replacement blocks with same cast number 365586 R1 but have cast size C 264 or C 281. Another thing that may point to a replacement block is a small flate plate on block near carburetor, held with 2 bolts. Hope this helps.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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