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Oh and one other thing, did you look inside the the cylinder with a boriscope (spelling?)? Check the face of the exhaust valve (the smaller one of the two) and look for uneven heat signatures. The face of the exhaust valve should have a very symmetrical appearance sort of like looking at a pizza with the sauce spread evenly over the entire crust. If the valve is not seating properly, the face will appear uneven where the "hot spot" is. If you see this, this is very bad and should be removed immediately.
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