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COMP Cams provides a complete line of valve stem seals including O-ring, umbrella and Positive-Stop PTFE options. The 513 PTFE seal has a .600" outer diameter and fits 5/16" valve stems with .600" OD guides. These seals prevent oil from entering the combustion chamber and the PTFE Positive-Stop option is recommended where extra clearance for dual springs is required.
COMP Cams Valve Seals 5/16in PTFE W/.500
