Speedmaster LS Steel & Viton Valve Stem Seals

Speedmaster LS Steel & Viton Valve Stem Seals are positive-stop engine valve stem oil seals. They control how much oil reaches the valve stem as it slides in the valve guide. These performance valve seals are for engine builders and enthusiasts who want reliable oil control in a rebuild or upgrade.

Key Features:

• Positive-stop design: Positive-stop (posi-stop) seals manage oil on the valve stem.
• Viton material: The seals are made from high-temperature Viton rubber for a long-lasting seal.
• Steel-cased construction: The steel and Viton construction gives the seals durability in demanding engine environments.
• Balanced lubrication: Too little oil causes stem and guide wear. Too much oil increases oil consumption and can build up carbon, which can damage the valve seat and lead to an early valve grind.
• Spring compatibility: Designed to work with single and dual valve spring setups.
• No machine work required: The seals install without additional machining.

Choose the option from this product line that matches your valve guide and valve stem requirements. Speedmaster valve stem seals help protect valve guides, reduce oil consumption, and keep the valvetrain lubricated correctly in street and performance engines.