Speedmaster 8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals 0.4825" Guide PCE354.1003

The Speedmaster PCE354.1003 is a precision valve stem seal designed for LS-series small-block engines. These 8mm seals feature dual/single spring construction with durable steel and Viton components, engineered to fit 0.4825" valve guides and maintain critical sealing integrity in high-performance engine applications. The combination of steel durability and Viton elastomer ensures reliable performance across varying temperatures and pressures.

These valve stem seals are essential for preventing oil leakage past the valve guide interface, reducing oil consumption and protecting engine efficiency. Built with LS engine specifications in mind, they deliver the precision fitment and material quality required for engine rebuilds, performance upgrades, and restoration projects. Whether you're performing a complete engine overhaul or targeted seal replacement, these Speedmaster seals provide the reliability and compatibility needed for serious LS applications.

Key Features & Benefits

• 8mm Size: Engineered for standard LS engine valve guide specifications.
• Dual/Single Spring Design: Maintains consistent sealing pressure across engine operating ranges.
• Steel & Viton Materials: Combines steel durability with Viton elastomer for temperature and chemical resistance.
• 0.4825" Guide Fitment: Precision bore size ensures proper fit and sealing on compatible LS valve guides.
• LS Engine Compatibility: Purpose-built for LS-series small-block engine applications.

Specifications

Ideal Applications

• LS engine rebuilds and overhauls
• High-performance engine upgrades
• Engine restoration projects
• Oil consumption reduction and sealing maintenance