1.590 Extreme Duty Exh Valves GM LS 62L L92

The MANLEY 1.590 Extreme Duty Exhaust Valves for GM LS 6.2L L92 engines represent purpose-built cylinder head components engineered for high-performance and forced-induction applications. This set of eight stainless steel exhaust valves features a 1.590-inch head diameter and 0.313-inch valve stem, delivering the precision geometry required for aggressive LS-series engine builds where factory valves fall short of sustained demand.

Designed specifically for the L62 and L92 cylinder heads found in late-model GM LS platforms, these extreme-duty valves withstand higher combustion pressures and extended heat cycles typical of turbocharged, supercharged, and nitrous-assisted engines. The 4.923-inch overall length maintains OEM-compatible installation geometry while the enhanced material composition and heat treatment resist valve recession and thermal fatigue—critical factors in forced-induction and high-boost applications where exhaust gas temperatures routinely exceed stock parameters.

LS engine builders and performance shops specify MANLEY components for serious power builds—LS1, LS2, LS3, LS6, L92, and other variants requiring valve upgrades beyond stock tolerance. Whether supporting a 600+ horsepower build, boosted application, or extended-duration cam profile, these exhaust valves provide the metallurgical reliability and dimensional precision that separate marginal builds from proven track performers.

MANLEY's reputation in the engine component market rests on direct partnerships with OEM programs and racing teams. These extreme-duty exhaust valves ship as a complete set of eight and integrate directly with matching LS intake valve options and valve spring packages for balanced cylinder head assembly.