Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.422in O/A Length, 0.3110in Stem

Manley Performance is well-known for making strong engine components for racing and high-performance applications. This exhaust valve kit is a prime example, built for Chevrolet big block engines where durability under extreme conditions is key. These valves are designed to handle the intense heat and stress found in high-performance gasoline engines, ensuring your engine runs reliably when you push it hard.

Crafted from XH-428 material, these exhaust valves offer exceptional strength at high temperatures, significantly outperforming other common exhaust valve materials. The stems are chromed for added wear resistance, and the tips are hardened for longevity. Manley also paid attention to airflow with swirl-polished under-head areas and fully machined faces, which helps optimize how the air and fuel mixture enters the cylinder, leading to more efficient combustion.

These valves have been put through rigorous fatigue testing, enduring millions of cycles at high temperatures and pressures far beyond normal operating conditions. This level of testing means they are built to last, even in demanding racing or performance builds. If you're rebuilding the top end of a Chevrolet big block and need exhaust valves that can withstand serious abuse, these are a solid option.