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Registered
Join Date: Apr 2009
Location: Cape Vincent, NY
Posts: 841
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It cannot make a badly leaking seat good, but minor pitting/wear can be lapped out. The process removes a small, minuscule, microscopic, tiny little bit of metal (it is basically hand-grinding). A quick fine-lap (just a few spins of the valve) is great way to check on machine-shop regrinds.
Just clean the valve and head about 5 times after you do it to make sure no grit is left.
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1968 911S "Leona"
Air goes in and out, blood goes round and round, any variation on this is a bad thing.
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