My guess would be they were caused from extreme over heating.
As low compression those engines are, I doubt wrong plugs or way too much timing advance would cause that, but I could be wrong.
Several factors would determine if they are usable. Once they are out look at the skirt. If it's been really hot, they are probably scuffed and seized. That may be why they won't come out... If they are, likely not usable.
Another thing to check, how thick is the top? If they are burned 1/4" deep, probably not much left. Can that be repaired? Yes, it could be ground out and welded up, but unless you have the equipment or connections, probably cost as much as replacing them.
And, what is this going to be? A working tractor or show? Do you feel lucky? LOL
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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