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Zen,
My take on valve guide wear has always laid the blame on the valve stem seals, not the guides themselves. The seals did not allow enough oil to the stem, and wear resulted. I suppose you could replace the original guides with anything (I would only use the original Porsche part) but without the proper seals (the white ones) you could get early guide wear again. I just replaced all guides and valves in my '88 at 110,000 miles with the original guides and white seals and I do not feel I have anything to worry about for years.
Regards,
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Thomas Owen
1972 911T
1972 911S
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