Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.465in O/A Length, 0.3415in Stem

This kit includes Manley's Severe Duty? exhaust valves, specifically designed for Chevrolet Small Block engines. These valves are crafted from XH-428 material, a substance Manley states is unmatched globally for exhaust applications, offering nearly double the tensile strength at high temperatures compared to other materials like EV-8. They feature chrome stems and hard tips for added durability, along with swirl-polished under-head areas and fully machined faces to help optimize airflow and combustion efficiency.

Manley has put these valves through rigorous testing, including cycles at 40,000 psi and 1400°F. The manufacturer reports they endured up to 100 million cycles, which they claim is significantly longer than competing valves that failed much sooner. This level of fatigue resistance is crucial for high-temperature gasoline engines where valves experience substantial stress, especially during valve bounce.

If you're rebuilding the top end of a Chevrolet Small Block engine and need exhaust valves that can handle demanding conditions, these Manley Severe Duty? valves are a solid option. They are designed for high-temperature gasoline engines and are built to last.