TRW Valves - Okay to use on a rebuild?

[vasana]

Valve Stem Oil Seal - which is the best to use?
Thanks in advance.

[Tyson Schmidt]

Viton will seal the best.

I prefer the Teflon because they let a little more lubricating oil down the guide and prolong the guide and stem life.

(And TRW is the original supplier of the valves to Porsche.)

[khamul02]

But I see a lot of people saying avoid the TRW valves. Should they be used?

[cgarr]

I used to have problems with them, the stems would be nicked up but the past year have not had a problem. Like any new part, look it over before use.