GM LS7 S/D 1.615 Exhaust Valves

The MANLEY GM LS7 S/D 1.615 Exhaust Valves are severe duty performance components engineered specifically for General Motors LS-series engine platforms. This set of eight stainless steel exhaust valves delivers the thermal resistance and durability required in high-output, high-heat engine applications where OEM valves reach their limits. Built from premium stainless material, these valves are designed to withstand the extreme combustion pressures and temperatures generated by modified, turbocharged, and naturally aspirated LS engines running aggressive fuel and ignition timing.

Each valve features a 1.615-inch head diameter, a 0.314-inch valve stem, and measures 5.230 inches in length—dimensions that maintain precise intake and exhaust flow geometry within the LS cylinder head casting. The severe duty rating indicates these valves are constructed to withstand sustained higher RPM operation, increased boost pressures, and thermal cycling that would degrade standard valves. The 1.615-inch head size is the correct specification for LS7-series engines, where larger valve diameters improve volumetric efficiency and scavenging. Stainless construction provides superior corrosion resistance and thermal fatigue resistance compared to ferrous alternatives, critical when engine coolant temperatures and EGT readings climb during street and competition use.

These exhaust valves are the choice for LS engine builders and enthusiasts upgrading cylinder head flow on stroker engines, forced induction builds, and race applications where valve reliability directly impacts engine longevity. Whether supporting a mild cam upgrade or a full competition build, MANLEY's engineering ensures consistent thermal stability and dimensional precision across the complete 8-valve set. Proper installation requires correct valve seat machining and compatible spring pressures; consultation with your engine builder or cylinder head specialist is recommended to ensure optimal clearances and function within your specific application.