BBC E/D 1.940 Exhaust Valves

The MANLEY BBC E/D 1.940 Exhaust Valves are purpose-built extreme-duty components engineered for big block Chevy applications demanding maximum durability and thermal resistance. This set of eight stainless steel exhaust valves delivers the hardened construction required in high-RPM, high-heat engine environments where standard valves compromise performance and reliability.

Each valve features a 1.940-inch head diameter paired with a 0.372-inch valve stem and extends 5.454 inches in length, specifications designed to optimize flow characteristics and seating geometry in large-displacement big block Chevy engines. The stainless steel construction provides superior corrosion resistance and maintains structural integrity under sustained high-temperature cycling—critical for forced-induction applications, supercharged builds, and competition engines where exhaust valve temperatures routinely exceed 1,400 degrees Fahrenheit. The extreme-duty designation indicates these valves meet or exceed the demands of motorsports applications and street-strip hybrid builds.

This valve set is specified for engine builders and enthusiasts developing high-output BBC powerplants for drag racing, land-speed competition, and performance street applications. Whether building a carbureted big block or fuel-injected LS alternative, BBC heads require matched exhaust valve sets that won't fail under boost or extended WOT operation. The 1.940-inch head size is the industry standard for large-port BBC cylinder heads and ensures direct fitment compatibility across Brodix, Dart, and OEM Chevrolet Performance applications.