Rich: parting out a 504 is a hard call, they didn't have sleeves, thus most of those engines are reaching the end of the line as far as rebuilding. The rest of the tractor holds up very well, thus there may not be big demand for the parts, other than the engine.
A working 504 with the D-188 diesel or a more reliable gas engine is still a very usable tractor, with IPTO, 3point hitch and forward operators platform. The 300 or 350 engine will be a direct bolt up at the rear. You will probably have to modify, front engine mounts, fan shroud assembly, breather, radiator hoses, etc. Shouldn't be too bad as engine will be close in size.
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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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