
COMP Cams · New
COMP Cams Valve Seal 3/8 Viton Metal Body
MPN 521-1 · Store SKU cca521-1
Supplier stock checked 11/7/2026, 9:46:22 PM UTC. Adding a part does not reserve it.
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Product details
Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 521 seal has a .545" OD and fits applications with 3/8" valves and .500" OD guides. 1 Metal Body Viton Valve Seal for .500" Guide Size, 3/8" Valve Stem 3/8 X .500 Viton Metal Body Seal .540 OD
Manufacturer fitment & guides
- Engines w/ 0.500" OD Valve Guides and 3/8" Valve Stems
- Manufacturer-supplied application summary from Turn14; this may not be an exhaustive fitment list.
Part-specific notes
- California Proposition 65: Y