Thank Dave, I have no pieces of dead valves seals, and no gain on the compression with oil in cylinder! I will think of that this winter, if I do just one head or 2, or run it like that, or overhaul all the engine
I have 1965 300 2 barrels, everything is stock, it run well at normal speed, but when traffic jam it start to run bad, stumble and exhaust pop, and after 5 min to run in normal speed it run good!