Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.165in O/A Length, 0.3415in Stem

These Manley Extreme Duty Series exhaust valves are forged from XH-432 XtremeAlloy, a material chosen for its exceptional resistance to extreme heat and force. This makes them a top choice for high-performance applications like Top Fuel drag racing, marine engines, and restricted carburetor circle track racing where engine components are pushed to their absolute limits. The valves measure 1.625 inches across the head diameter and have an overall length of 5.165 inches, with a 0.3415-inch stem diameter, ensuring they fit precisely into compatible cylinder heads.

Beyond the advanced alloy, these valves are built for longevity and improved airflow. They feature chrome stems and hard tips, which significantly increase wear resistance and help them stand up to the rigors of intense combustion cycles. The under-head areas are swirl polished to help smooth the flow of exhaust gases, while the combustion faces are fully machined. This attention to detail in their construction helps improve airflow efficiency and contributes to better combustion, ultimately benefiting the engine's overall performance.

When you're building an engine that needs to withstand extreme conditions, components like these valves are critical. They are designed to be a direct replacement for stock exhaust valves in many Chevrolet Small Block applications, but their specialized materials and construction make them ideal for builds that demand more than standard parts can offer. Ensure you consult your engine build specifications to confirm compatibility with your specific cylinder heads and camshaft requirements.