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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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