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Set of 16 PTFE Valve Seals for .500" Guide Size, 11/32" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 510 seals have a .600" outer diameter and fit applications with 11/32" valves and .500" OD valve guides.

1 Steel Viton Valve Seal for .500" Guide Size, 8mm Valve Stem; Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 511 seal has a .600" OD and fits LS applications with 8mm valves and .500" OD guides.

Set of 12 Steel Viton Valve Seals for .500" Guide Size, 8mm Valve Stem; Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 511 seals have a .600" OD and fit LS applications with 8mm valves and .500" OD guides.

1 PTFE Valve Seal for .500" Guide Size, 3/8" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. This 512 seal has a .600" outer diameter and fits applications with 3/8" valves and .500" OD valve guides.

Set of 12 PTFE Valve Seals for .500" Guide Size, 3/8" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 512 seals have a .600" outer diameter and fit applications with 3/8" valves and .500" OD valve guides.

Positive Stop PTFE Valve Seal for Ford 5.0 Coyote; Valve Seals: for 6mm Valves and 11mm Guides - Single

Set of 32 Viton Valve Seals for 2006-2016 GM 6600/6.6L Duramax Diesel; Constructed from Viton, thiese seals ensure a tight fit on 2006-2016 Duramax Diesels' 7mm valves. Designed specifically for use on the 0.450" guide diameter of the '06-'15 Duramax.

1 PTFE Valve Seal for .500" Guide Size, 5/16" Valve Stem; COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. This 513 seal has a .600" outer diameter and fits applications with 5/16" valves and .500" OD valve guides.

Set of 12 PTFE Valve Seals for .500" Guide Size, 5/16" Valve Stem; 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.

Set of 16 PTFE Valve Seals for .500" Guide Size, 5/16" Valve Stem; 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.

1 Metal Viton Valve Seal for .500" Guide Size, 3/8 Valve Stem; Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 514 seal has a .625" OD and fits applications with 3/8" valves and .500" OD guides.

Set of 12 Metal Viton Valve Seals for .500" Guide Size, 3/8 Valve Stem; Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 514 seals have a .625" OD and fit applications with 3/8" valves and .500" OD guides.