I've had 5 or 6 Ms over the years,heres a bit of what I have learned.If it's a true '39,it will have the 'water trough' deck.All others had the common flat deck.Later M had a bent stick. The Super weht back to the straight stick.I acctually bent the stick of my Super to get out of the way from my leg when in low gear. The earliest M had the small(1 1/8") shaft.You can easily change it to the larger (1 3/8") shaft. The distilate/all fuel piston should be a flat top.The Gas is probably a domed piston.Something I learned with an F20. Distilate/kerosene uses less oxygen than gasoline. Consequently it had a smaller hole in the venturi,cause black smoke,running very rich,tended to foul plugs with black soot....We 'bored out' the venturi. It could then get more oxygen,and ran clear and had more power. An old Harley mechanic friend figgured this one out.The earlier Ms used a much bigger around filter. The later and Supers used a 'thinner' filter.Filter bases could be changed. My parts SMTA has the earlier big filter. Why??? Maybe a PO though extra filtering capacity would lengthen the life or the engine?I think you could swap heads,but not entirely sure.Just make sure there is no valve interference.Domed pistons would help the most.Find a set of 8000 ft pistons.I also tweeked the governor a bit.Got a hundred or so more rpm. Really helps on the hard pulls.You can date them by just looking at the date codes on the engine/trans/rear end houseings.IH acctually changed a fair amount of stuff during the production years.'Improvements'.Any more questions,or talk tractors,just call me.You have my number. Steve
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