Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.465in O/A Length, 0.3415in Stem

Manley Performance is well-known for making strong engine components, especially for racing applications. This exhaust valve kit is a prime example, featuring their Severe Duty? valves designed specifically for high-temperature gasoline engines. If you're working on a Chevrolet Small Block and need reliable exhaust valves that can handle serious heat and stress, these are a solid option.

These valves are crafted from XH-428 material, which Manley states has nearly double the ultimate tensile strength at 1500°F compared to other common exhaust valve materials like EV-8. They've also undergone rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400°F, which is a notable improvement over 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 and combustion efficiency.

This kit includes exhaust valves with a 1.600-inch head diameter, a 5.465-inch overall length, and a 0.3415-inch stem diameter. For the best results, always refer to the manufacturer's installation instructions and ensure you have the correct tools and procedures for your specific engine build.