COMP Cams Valve Seal 6mm Stem x 11mm Guide OD - 523-32

Positive Stop PTFE Valve Seals for Ford 5.0 Coyote

Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 523 seal has a OD and fits applications with valves and OD guides.

Valve Seals: for 6mm Valves and 11mm Guides - 32 qty

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 from 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. Smaller diameter Viton seals are also available for triple spring applications. Both the o-ring and the umbrella seals require no machining, but when using the PTFE seal it is necessary to disassemble the heads and machine the top of the guide with a special cutter.