It may be just me but what is the valve clearance in the engine. When cold the valves might have enough clearance to work pretty well. Then as the engine is warming up the valves grow and the clearance disappears holding the valves open slightly. This will give the engine a doggy symptom. Without having a dead spark issue like a coil getting hot I would think it would be mechanical with the valves. It isn"t a big deal to lift the hood and valve cover to check this. Maybe since the engine rebuild the valves are seating in a little farther then when the engine was first done. Just a thought.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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