SBC S/D 1.600in Exhaust Valve

The MANLEY SBC S/D 1.600in Exhaust Valve is a severe-duty exhaust valve engineered for high-performance small block Chevy and small block Ford engines demanding reliability under extreme combustion pressures and elevated temperatures. This is the component you choose when stock valves can't handle sustained rpm, aggressive cam profiles, or nitrous oxide exposure. Severe-duty exhaust valves are critical for any engine builder serious about longevity in forced-induction, naturally aspirated race, or street/strip applications where heat cycling and valve seat recession are constant threats.

Constructed from stainless steel, the MANLEY valve features a 1.600-inch head diameter paired with a 0.342-inch valve stem and extends 5.165 inches in overall length—geometry optimized for small block cylinder head port velocities and sealing integrity. The stainless construction resists oxidation and thermal fatigue far better than iron valves, maintaining surface finish and dimensional stability across repeated thermal cycles from cryogenic intake temperatures to 1,200°F+ exhaust conditions. The severe-duty classification means this valve has been enhanced with superior metallurgy, tighter tolerances, and premium seat contact surfaces to prevent burning, warping, and premature wear during extended high-boost or high-RPM operation.

Street and professional engine builders, bracket racers, and enthusiasts building or refreshing small block Chevy or Ford heads will benefit from the durability and consistency MANLEY valves deliver. Installation requires proper valve seat machining, spring rates matched to your specific cam profile, and correct installed height—consult your cylinder head specifications and cam manufacturer's recommendations before ordering. Sold individually; exhaust valve sets require two units per engine. This valve integrates seamlessly with stock or ported heads and pairs reliably with aftermarket valve springs, retainers, and keepers rated for severe-duty applications.