Supertech Honda LS / Mitsubishi (Reduced Dia) 6.6mm Viton Exhaust Valve Stem Seal

This is a Supertech Viton exhaust valve stem seal, specifically designed for Honda LS and Mitsubishi engines with a reduced diameter application. Valve stem seals are crucial for preventing oil from entering the combustion chamber through the valve guides. When these seals wear out, you might notice blue smoke coming from your exhaust, especially on startup or deceleration, and your oil consumption can increase.

This particular seal is made from Viton, a high-performance fluoroelastomer known for its excellent resistance to heat and aggressive engine oils. The 6.6mm size is a precise fit for the intended applications, ensuring a proper seal against the valve stem. Replacing worn valve stem seals is a common part of engine rebuilding or repair, helping to restore proper engine function and reduce oil burning.