SKU: MAN11803-8
UPC: 807298052854
MPN: 11803-8
The BBC S/D 1.940in Exhaust Valves are purpose-built severe-duty exhaust components engineered for big-block Chevy engines that demand reliable, high-temperature performance. These valves are designed for builders and enthusiasts pushing their BBC powerplants beyond stock limits—whether for street performance, racing, or high-output street-strip applications. The set of eight valves ensures you have matched pairs across all cylinder banks, critical for even scavenging and consistent exhaust flow dynamics that translate to better throttle response and peak horsepower delivery.
Constructed from stainless steel for superior thermal resistance and corrosion protection, the BBC S/D 1.940in Exhaust Valves feature a 0.342-inch valve stem and measure 5.422 inches in length, meeting OEM and aftermarket BBC cylinder head port specifications. The 1.940-inch head diameter is optimized for efficient exhaust gas evacuation while maintaining structural integrity under sustained high-RPM operation and elevated combustion temperatures. Stainless construction resists oxidation and burning, extending component life in severe-duty applications where exhaust gas temperatures routinely exceed 1200 degrees Fahrenheit. This material choice also reduces valve shrinkage and seat recession, ensuring long-term compression retention and combustion sealing.
These valves are ideal for engine builders, restoration specialists, and high-performance enthusiasts rebuilding BBC cylinder heads in applications ranging from vintage muscle cars to modern custom engines. Installation requires proper valve seat machining and spring pressure matching to your specific intake geometry and RPM target; work with an experienced machine shop to confirm valve spring rates and installed heights for optimal performance. The BBC S/D 1.940in Exhaust Valves are compatible with all big-block Chevy cylinder heads that accept 0.342-inch stem diameter valves and are commonly paired with performance intake valves, roller rocker arms, and upgraded valve spring assemblies for maximum reliability and flow.
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