BBC SD Exhaust Valve 1.940 11/32 6.400 OAL

The Manley BBC SD Exhaust Valve 1.940 11/32 6.400 OAL is a precision-engineered cylinder head component designed for big-block Chevrolet (BBC) high-performance and racing applications. This exhaust valve serves as the critical flow control element responsible for evacuating burned combustion gases from the combustion chamber during the exhaust stroke. Purpose-built for engine builders and mechanics working with big-block platforms, this valve is essential for maximizing exhaust scavenging efficiency and maintaining proper thermal management in modified engines operating at elevated RPM and boost levels.

Manley's engineering delivers exceptional durability through premium stainless steel construction, selected specifically for exhaust valve applications where temperature resistance and corrosion prevention are non-negotiable. The 1.940-inch head diameter is engineered to provide optimal seating area and flow characteristics for BBC cylinder heads, while the 11/32-inch stem diameter ensures compatibility with standard valve guide bores. The 6.400-inch overall length (OAL) specification is critical for proper installation depth and rocker arm geometry; this dimension must match your specific cylinder head and valvetrain configuration to prevent valve-to-piston contact and maintain correct valve timing events.

The SD designation indicates Manley's specialized design for sustained high-RPM operation, featuring superior hardness and wear resistance compared to standard OEM components. This valve is ideal for those looking to enhance performance in high-stress environments, ensuring reliability and efficiency in demanding racing conditions. Engine builders and performance enthusiasts will find this exhaust valve to be a crucial component in achieving optimal engine performance.