LS1 S/D 1.550 Exhaust Valves

The MANLEY LS1 S/D 1.550 Exhaust Valves are precision-engineered components designed specifically for GM LS-series engine builds. This eight-piece stainless steel exhaust valve set delivers the flow characteristics and durability demanded by serious engine builders and high-performance enthusiasts working on LS platforms. Each valve features a 1.550-inch head diameter, 0.3136-inch valve stem, and 4.923-inch length, engineered to handle the thermal and mechanical demands of modified LS powerplants.

Stainless steel construction provides superior heat resistance and corrosion protection compared to standard mild steel valves, critical for engines running elevated boost, nitrous systems, or extended high-RPM operation. The 1.550-inch head diameter is the performance standard for LS1 exhaust port geometry, ensuring proper seating and optimal valve flow dynamics. These valves are manufactured to tight tolerances that match Manley's reputation for precision valve technology, with material composition and dimensional accuracy verified for consistent cylinder-to-cylinder performance across the eight-valve set.

This valve set is essential for engine builders constructing LSx race engines, street performance builds, or fresh LS engine assemblies requiring OEM-replacement or upgraded exhaust hardware. Whether building a naturally aspirated LS motor or a forced-induction platform, these valves form a critical foundation for reliable valve train operation. Manley LS1 valves are widely specified in competitive racing, restoration work, and professional engine shops where component reliability directly impacts performance and durability.

Compatible with LS1, LS2, LS3, LS6, and other LS-platform engines, this eight-valve set covers the complete exhaust valve requirement for a single engine. Manley's exhaust valve technology has been the choice of engine builders and racing programs for decades, and these LS-series valves maintain that standard for precision and performance in modern engine applications.