COMP Cams Valve Seals 5/16in PTFE W/.500

Fits: 5/16" Valve Stems - .500" Guides (.600" Seal Diameter)Valves Seals keep unwanted oil from entering the combustion chamber through clearance in the valve guidesSmaller diameter than COMP Umbrella Seals to allow use with double springs COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 513 seals have a .600" outer diameter and fit applications with 5/16" valves and .600" OD valve guides. Available individually under 513-1, available in a set of 12 under 513-12 Engines w/ 0.500" OD Valve Guides and 5/16" Valve Stems