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.
Available in a set of 8 under 521-8, available in a set of 12 under 521-12, available in a set of 16 under 521-16
Engines w/ 0.500" OD Valve Guides and 3/8" Valve Stems
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