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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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