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 - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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