5/16 Viton Valve Seals (8pk)

The MANLEY 5/16 Viton Valve Seals 8-pack (MPN 24047-8) are precision engine sealing components engineered for valve stem applications requiring reliable fluid containment and thermal resistance. Manufactured with Viton elastomer material, these valve stem seals are designed for use on 5/16-inch valve stems with a 0.530-inch guide bore outer diameter, making them compatible with a wide range of small-block and performance engine builds where OEM or upgraded sealing performance is critical.

Viton fluorocarbon sealing material provides superior chemical resistance and temperature stability compared to standard nitrile compounds, maintaining seal integrity across demanding temperature ranges found in high-performance and turbocharged engine environments. The 0.530-inch guide OD specification ensures proper fitment on valve guides engineered to this standard dimension. This eight-seal pack provides a complete set for a typical four-cylinder engine or partial set for larger displacement applications, delivering MANLEY's proven engineering standards in a cost-effective replacement or upgrade configuration.

Engine builders, restoration specialists, and performance technicians use MANLEY valve seals when rebuilding or upgrading cylinder head assemblies where OEM seals no longer meet durability or thermal requirements. Whether performing a full engine rebuild, addressing chronic oil burning from worn original seals, or upgrading to enhanced sealing during a performance refresh, this Viton valve seal kit addresses the fundamental requirement of preventing crankcase blowby and maintaining proper valve train lubrication. The compact 0.12-pound pack ships efficiently while containing the precision components needed for dependable long-term engine operation.