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The Supertech 8mm valve stem seal set for GM LS engines is supplied as a set of 16 and uses the stem dimension noted in the description. These seals are intended to restore proper sealing at the valve stem area and are packaged to handle a complete LS‑style valvetrain service that requires 16 seals for intake and exhaust ports as listed.
Supertech GM LS 8mm Valve Stem Seal - Set of 16
