COMP Cams Valve Seals 11/32in StemCOMP Cams offers a complete line of valve stem 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, in the case of a double spring, the positive stop PTFE Seal is
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