COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. This 503 seal has a .630" outer diameter and fits applications with 11/32" valves and .530" OD valve guides.
Available in a set of 12 under 503-12, available in a set of 16 under 503-16
Engines w/ 0.530" OD Valve Guides and 11/32" Valve Stems
