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I have not had good luck with hard chrome stem valves. I only use Kibblewhite Black Diamond valves and Ampco 45 high nickel content guides from MAP for street bikes. The combination is bulletproof when set up properly..with the correct tolerance. If your seats are pocketed, then you may be able to salvage the situation with .060" oversize valves from Kibblewhite. No seals or guide machining needed. The meager oil squirt from the rocker arms falls on the valve spring top retainer and doesn't flood the top of the guide.
The stock seats as fitted to all of the alloy heads are very hard and capable. I would only change them if the seats are seriously pocketed. The way to tell that is to pack the springs to the recommended length. If you need more than .100" shims with new stock springs, you need new seats or oversize valves.
[ This message was edited by: Mecchanica on 2007-02-26 06:34 ]
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Triumph old, Triumph new, any Triumph will do.
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