Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.540in O/A Length, 0.3110in Stem

Manley Performance is well-known for making strong internal engine components, especially for racing applications. This exhaust valve kit is a prime example, featuring their XH-428 material specifically chosen for its ability to handle high temperatures and extreme stress in Chevrolet Small Block engines. If you're rebuilding a high-performance or racing engine, these valves are built to last under demanding conditions.

These valves have undergone rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400?F. This is a notable improvement over many competitor valves that can fail much sooner. The XH-428 material itself offers nearly double the tensile strength at 1500?F compared to other common exhaust valve materials like EV-8. They also feature chrome stems and hard tips for added wear resistance, along with swirl-polished under-head areas and fully machined faces to help optimize airflow and combustion efficiency.

This kit includes exhaust valves with a 1.625-inch head diameter and a 5.540-inch overall length, featuring a 0.3110-inch stem diameter. While designed for high-temperature gasoline engines, it's always a good idea to consult your engine's specific build requirements and manufacturer instructions for optimal installation and performance.