Manley Chevrolet Small Block Severe Duty Exhaust Valves 1.500in Head Dia .3415in Stem - Set of 8

Manley's Severe Duty exhaust valves are built from XH-428 material, a specialized alloy that offers nearly double the ultimate tensile strength at 1500°F compared to common EV-8 materials. This makes them a solid choice for high-temperature gasoline engines, especially when you're pushing your Chevrolet Small Block hard. These valves are designed to handle the intense stress and heat cycles that can occur during normal operation and even when valve bounce happens, which can multiply the applied stress significantly.

You can expect improved airflow and combustion efficiency thanks to the swirl-polished under-head areas and fully machined combustion faces. The chrome stems and hard tips add to their durability, helping them last longer in demanding conditions. Manley put these valves through rigorous fatigue testing, showing they can endure up to 100 million cycles at 40,000 psi and 1400°F, which is a notable improvement over many other options that might fail much sooner.

This set includes eight exhaust valves, each with a 1.500-inch head diameter and a .3415-inch stem diameter, ready for your Chevrolet Small Block build.