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Ed: Nice little unit you have there. I have thought of trying much the same. I'm thinking the U joint could allow one to raise the steering wheel a bit to make operators platform more comfortable. Not sure about the word SPECIAL. Just wondering if it may have been a replacment block from IH, shortly after tractor was new. At that time, scrapyard engines would have been rather scarce. Could have been an accident, cracked block, etc. How does the engine serial number compare with tractor serial number? What are casting codes on engine? Also what are other casting codes? What is the engine block part number? These could answer your question. Engine serial is right under No 1 plug on flat machined surface and is stamped rather than cast in place. Casting date codes are cast in place and numbers for month and day and letter for year. Have what looks like a round head blade screw cast between digets. Engine part number will be cast in place and 3/4" high numbers ending in R1, R2 or R3. Oh, the letter for 51 is W, 52 is X, 53 is Y. You can go both ways from that, V was not used.
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