COMP Cams Valve Seals 5/16in PTFE

Fits: 5/16" Valve Stems - .530" Guides (.630" Outer 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 500 seals have a .630" outer diameter and fit applications with 5/16" valves and .530" OD valve guides. Available individually under 500-1, in a set of 12 under 500-12 Engines with 0.530" OD Valve Guides and 5/16" Valve Stems