Providing the best sealing properties and spring clearance, Viton valve seals are an excellent choice in performance applications. The 518 seals have a .575" OD and fit applications with 11/32" valves and .530" OD guides.
Comp Cams(R) 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. Small-diameter Viton seals are also available for triple spring applications.
| Year | Make/Model |
|---|---|
| Engines | w/ 0.530" OD Valve Guides and 11/32" Valve Stems |
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