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COMP Cams offers Positive Stop PTFE valve seals for 5/16" valve stems that fit .530" OD valve guides and use a .630" outer diameter. These seals are intended to prevent oil from entering the combustion chamber through guide clearance and to allow use with double-spring valve setups. The line also includes other seal styles for different spring architectures when required.
COMP Cams Valve Seals 5/16in PTFE
