fixed a lot of them with a kit from NAPA , rethread the hole and put in an insert, never had a problem after. I have seen some of those heads that only had 2 or 3 threads for the spark plug, so it isn't just installer error , and several that blew out with very low miles before anyone had tampered with them , and some that blew after someone replaced plugs. bottom line is its an easy fix for anyone that bends wrenches for a living, so no big deal. lots easier than putting rings in an oil burner chevy , or timing chain issues, or the aforementioned intakes.....they all have their issues people.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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