I went through this a little while back when I noticed the same thing you describe in a '51 M I have. It's serialed as a 5000 ft. tractor, but the block is a replacement, cast in '58 or '59 so I don't know exactly what's going on. But I found the same thing by looking in the spark plug hole, a 1/4" to 5/16" dome on the pistons.
More recently I bought a Super M that came brand new on propane, MUCH bigger dome!
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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