Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.265in O/A Length, 0.3415in Stem

If you're rebuilding the top end of a Chevrolet small block engine, especially for high-temperature gasoline applications, these Manley Severe Duty? exhaust valves are a solid option. They're made from XH-428 material, which is notable for its strength at high temperatures – Manley states it has nearly double the ultimate tensile strength at 1500°F compared to competitor materials like EV-8.

These valves have undergone extensive fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400°F, which is a significant improvement over competitor parts that failed much sooner. They also feature chrome stems and hard tips for added durability, and the under-head areas are swirl polished to help improve airflow and combustion efficiency.

This kit includes the exhaust valves, designed to fit right into your existing small block Chevy cylinder heads. Make sure to check the manufacturer's installation instructions for any specific requirements when installing these performance valves.