COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 505 seals have a .630" outer diameter and fit applications with 3/8" valves and .530" OD valve guides.
Available individually under 505-1, available in a set of 16 under 505-16
Engines w/ 0.530" OD Valve Guides and 3/8" Valve Stems
