Manley Chevrolet Big Block Exhaust Valve Kit - 1.800in Head Dia. 5.930in O/A Length, 0.3415in Stem

This kit includes a set of Manley Severe Duty? exhaust valves, specifically designed for Chevrolet Big Block engines. These valves are crafted from XH-428 material, known for its exceptional strength at high temperatures, and feature a 1.800-inch head diameter and a 5.930-inch overall length with a 0.3415-inch stem diameter. They are built to handle the demanding conditions of high-temperature gasoline engines.

Manley's Severe Duty? valves are a well-built option for performance and racing applications. The XH-428 material used for the exhaust valves offers significantly higher tensile strength at elevated temperatures compared to common alternatives. These valves have undergone rigorous fatigue testing, enduring up to 100 million cycles at 1400?F, which is substantially longer than many competing valves. They also feature chrome stems and hard tips for added durability, along with swirl-polished under-head areas and fully machined faces to promote better airflow and combustion efficiency.

When rebuilding the top end of your Chevrolet Big Block, especially for high-performance or racing use, these valves are a solid choice. Their robust construction and advanced materials are intended to provide reliable performance under stressful operating conditions.