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COMP Cams metal-body Viton valve seal (11/32" with .530" guide compatibility) is intended for triple-spring use where extra clearance and reliable sealing are needed. The 518 seal has a .575" outer diameter and fits 11/32" valve stems with .530" guide bores, providing the dimensional allowance and Viton sealing preferred in demanding spring packages.
COMP Cams Valve Seal Viton Metal Body W
