Speedmaster PCE354.1004 LS Valve Stem Seals Steel Viton Guide - 8mm 0.500

The Speedmaster PCE354.1004 valve stem seals are engineered specifically for LS engine builds requiring precise oil control and durability. These premium seals feature an 8mm stem diameter design compatible with 0.500-inch valve guides, making them ideal for performance LS1, LS2, LS3, LS6, LS7, and LSX cylinder head applications.

Key Features:

• Steel outer body construction for maximum durability and heat resistance
• Viton rubber sealing element provides superior oil control and longevity
• Compatible with both dual and single valve spring configurations
• 8mm valve stem diameter fitment
• Designed for 0.500-inch (12.7mm) valve guide outer diameter
• Suitable for intake and exhaust valve applications

These valve stem seals are essential components during cylinder head rebuilds or upgrades, preventing excessive oil consumption while maintaining proper valve lubrication. The steel and Viton construction ensures reliable performance under high-temperature operating conditions typical of performance and racing applications. Sold as individual seals, allowing you to purchase the exact quantity needed for your specific engine configuration.