COMP Cams 517-1 Valve Stem Seals, PTFE, .500 Inch, 11/32 Inch, Each

517-1 - Valve Seal, MetalBody Viton 11 /32 W/.500.

COMP Cams offers a complete line of valve stem oil seals, from the stock GM o-ring to the positive-stop PTFE seal. These seals are a must to keep unwanted oil form entering the combustion chamber through the clearance in the valve guides. The o-ring seals use the standard retainer and oil splash shield. The umbrella seal is normally used when a larger than stock diameter spring is used, and in the case of a double spring, the positive-stop PTFE seal is used. Small diameter Viton seals are also available for triple spring applications.