Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.540in O/A Length, 0.3110in Stem

If you're rebuilding the top end of a Chevrolet small block engine, these exhaust valves from Manley Performance are a solid option. They are specifically designed for high-temperature gasoline engines and are made from XH-428 material, which offers nearly double the ultimate tensile strength at 1500°F compared to other common exhaust valve materials. This means they can handle the intense heat and stress inside your engine for a long time.

Manley puts these valves through rigorous fatigue testing. In fact, their exhaust valves have endured up to 100 million cycles at 40,000 psi and 1400°F, which is a notable improvement over many competitor valves that fail much sooner. They also feature chrome stems and hard tips for added durability, and the under-head areas are swirl-polished with fully machined combustion faces to help improve airflow and combustion efficiency.

This kit includes exhaust valves with a 1.600-inch head diameter, a 5.540-inch overall length, and a 0.3110-inch stem diameter. Ensure these dimensions match your specific engine build requirements.