Providing the best sealing properties and spring clearance, viton valve seals are an excellent choice in performance applications. The 520 seal has a .575" OD and fits applications with 5/16" valves and .530" OD guides.
Available in a set of 8 under 520-8, available in a set of 12 under 520-12, available in a set of 16 under 520-16
Engines w/ 0.530" OD Valve Guides and 5/16" Valve Stems
