Supertech 6mm Valve Stem Seal - Single OD 12.2mm Viton

With an outer diameter of 12.2mm, this Supertech valve stem seal is made from Viton, a material known for its excellent resistance to oil and high temperatures. This makes it a solid choice for keeping oil from entering the combustion chamber through the valve guides, which is crucial for maintaining engine performance and reducing oil consumption. When you're rebuilding an engine or just replacing worn-out seals, using a material like Viton helps ensure a long-lasting seal that can handle the demanding environment inside your engine.

This particular seal is designed for 6mm valve stems, a common size in many performance and import applications. Ensuring a proper seal around the valve stem prevents oil from leaking down the guide and into the cylinder, which can cause smoking on startup or during deceleration, and can lead to increased oil burning over time. Replacing these seals is often part of a larger top-end overhaul, helping to restore the engine's health and efficiency.