If it's the early M you want to put a gas head on? Take a look at the studs mounting the manifold to head. If 7/16 diameter instead of 3/8 the head has already been changed to something else. Lots of early ones have had the engine block replaced also. That tractor maybe was used as the main tractor on some farms for 15 to 20 years or more and rebuilt several times. After gasoline was common lots were rebuilt with gasoline parts. Most old M tractors have a 50 50 chance or less of having the original head still on them. You could already have a gas head, never know until you look.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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