Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.422in O/A Length, 0.3415in Stem

Manley Performance Products' Extreme Duty Series valves are built for the toughest Big Block Chevy applications. If you're working on a high-performance marine engine or a serious drag racing build that pushes the limits of heat and force, these exhaust valves are designed to handle it. They use Manley's XH-432 XtremeAlloy, a material specifically chosen for its ability to withstand extreme conditions found in Top Fuel, Funny Car, and demanding marine environments.

These valves are constructed with chrome stems and hard tips, which means they're built for exceptional longevity and wear resistance, even under heavy use. The design also includes swirl-polished under-head areas and fully machined combustion faces. This attention to detail helps improve airflow into the cylinder and can contribute to more efficient combustion. The specific dimensions are a 1.900-inch head diameter, 5.422-inch overall length, and a 0.3415-inch stem diameter, ensuring they fit precisely into the intended engine builds.

When you're assembling an engine that needs to perform under extreme stress, using components like these Manley exhaust valves is crucial. They are a well-built option for specialized applications where reliability and durability are paramount. Be sure to consult your engine build specifications to confirm these dimensions are correct for your specific project.