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 16 under 500-16
Engines with 0.530" OD Valve Guides and 5/16" Valve Stems
