Valve seal material

[73 Mike]

I'm about to pull apart my heads for inspection after my minor engine mishap.



Bird and others questioned my use of Teflon positive stop seals on a street engine because of the potential for excessive wear on the valve stems. Since I'll wreck these pulling the heads apart, this will be a good time to replace these if there is a better choice of material. These are essentially what I used:

http://www.summitracing.com/parts/CRN-99826-16/?rtype=10

For a lower mile, infrequently used, heavily driven motor, is there a better long term material than Teflon for an iron headed, moderate compresion 427 small block? Viton perhaps?

Opinions welcomed.

 

[Twin_Turbo]

I have found that the teflon seals actually pass more oil than the viton seals. The teflon often cracks and it creeps. fine for a low manifold vac race engine but on a street motor it really pollutes the chamber. The viton seals will wipe the stem better than the nylons, if too well..maybe remove the spring. IMO teflon seals = smoking engine