Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.522in O/A Length, 0.3415in Stem

If you're building a high-performance Big Block Chevy engine for serious drag racing, marine use, or restricted circle track competition, you need exhaust valves that can handle extreme heat and force. These Manley Extreme Duty Series exhaust valves are designed specifically for those demanding applications. They are built using Manley's XH-432 XtremeAlloy, a material chosen for its exceptional ability to withstand the intense conditions found in Top Fuel dragsters, Funny Cars, and high-output marine engines.

Beyond the advanced material, these valves are constructed for longevity and improved performance. They feature chrome stems and hard tips, which significantly increase wear resistance and help them stand up to countless cycles under extreme pressure. The under-head areas are swirl polished to help smooth airflow into the combustion chamber, and the combustion faces are fully machined. This attention to detail in their design helps improve airflow efficiency, contributing to better combustion and overall engine performance.

When you're pushing an engine to its limits, every component matters. These Manley valves are a solid choice for builders who need reliable performance and durability in the most extreme environments. They are designed to fit right and perform consistently, giving you confidence in your engine build.