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strangely enough a small ammount of lapping is allowed on used valves. I do it just enough to see where the seat is, ie just enough to mark the surface, but not to lap them togaher. I am not certain that even this proceedure is a good idea, but I do it. If really concerned you can use markum or a magic marker to accomplish the same thing without lapping the valves at all. In fact it is a required step to assure that the valve and its seat are concentric.
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