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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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