Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.265in O/A Length, 0.3415in Stem

Manley Performance is well-known for making strong internal engine components, and these Severe Duty? exhaust valves are a prime example. If you're working on a Chevrolet Small Block engine and need to replace or upgrade your exhaust valves, these are built to handle serious stress. They are specifically designed for high-temperature gasoline engines, meaning they can withstand the heat and pressure found in performance applications.

These valves are made from XH-428 material, which Manley states has nearly double the ultimate tensile strength at 1500°F compared to other common exhaust valve materials. They've also undergone rigorous fatigue testing, enduring up to 100 million cycles at high stress and temperature, which is a notable improvement over many competitor parts that failed much sooner. The chrome stems and hard tips add to their durability, while the swirl-polished under-head areas and fully machined faces help improve airflow into the combustion chamber.

This kit includes eight exhaust valves, each measuring 1.600 inches across the head and 5.265 inches overall in length, with a 0.3415-inch stem diameter. They are a solid option for anyone looking for robust exhaust valves that can handle demanding conditions.