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Just a thought, as I'm not sure of manufac process. But can you be sure that the valves were a one piece component. As valves were made by welding the head of the valve to the stem.
If you had it that wrong, you would have felt that the engine was not right within the distance you had travelled.
But sorry to see the mess you have to contend with.
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Ghost DD #61
If you always do what you always did, you will always get what you always got.
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