Pull the valve cover and check the clearance gap on the valves. I think you find the gap is way too narrow, and when the engine gets warmed up, the gap goes away altogether, and then the valves can no longer close completely, which will result in erratic running and loss of power. The book calls for 0.017" clearance gap with the engine hot, but if you set 'em at 0.020" cold, you will be in the ball park.
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Today's Featured Article - Dad's 1945 Farmall A - by Bobby Duke Jr.. I am writing about my Dad's 1945 Farmall A. The tractor was purchased in 1945 by his father, Mr. Davis Duke. It was used to farm tobacco from 1945 to 1963 by my grandfather and by my father.
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