Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.121in O/A Length, 0.3415in Stem

Manley Performance is well-known for making strong internal engine components, especially for racing applications. This kit includes exhaust valves specifically for Chevrolet Small Block engines, featuring a 1.625-inch head diameter and a 5.121-inch overall length with a 0.3415-inch stem. These valves are designed to handle the high stresses and temperatures found in performance gasoline engines.

Crafted from Manley's exclusive XH-428 material, these exhaust valves offer exceptional strength at high temperatures, far exceeding common industry materials. The stems are chrome-plated and feature hard tips for improved wear resistance, while the under-head areas are swirl-polished and the combustion faces are fully machined. This attention to detail helps improve airflow into the cylinder and promotes more efficient combustion. Rigorous fatigue testing shows these valves can endure up to 100 million cycles at high stress and temperature, a notable improvement over many other options.

This kit is a solid option for anyone rebuilding or upgrading a Chevrolet Small Block engine where durability and performance under demanding conditions are key. Ensure you have the correct valve spring and retainer setup to match these valves for optimal performance.