I too go for the heat shield solution. Root problem is probably the copper. It has a pretty good temperature coefficient meaning it changes resistance readily with temperature. That's why, when you see things like a power distribution standard where they talk about a 2% drop for a ......sized wire at a ....... current, the temperature is specified.
Copper gets hot, too much resistance in the circuit, limits the current to the plugs and as a results not enough energy to jump the gap and stay lit long enough to explode the fuel.
Many many times I have seen people with similar time related problems and find it's to the coil getting too hot.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil�s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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