Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.065in O/A Length, 0.3415in Stem

If you're rebuilding the top end of your Chevrolet Small Block engine, these Manley Severe Duty? exhaust valves are a solid option. They're designed to handle the high temperatures and stresses found in performance gasoline engines, featuring a 1.625-inch head diameter and a 5.065-inch overall length with a 0.3415-inch stem diameter.

Manley uses their exclusive XH-428 material for these exhaust valves, which offers nearly double the tensile strength at high temperatures compared to other common exhaust valve materials. This makes them exceptionally well-suited for demanding applications where heat resistance is critical. The valves also have chrome stems and hard tips for added durability, and the under-head areas are swirl-polished to help improve airflow into the combustion chamber.

These valves have been put through rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400?F, which is a notable improvement over many competitor parts. If you're looking for valves that can stand up to serious heat and stress in your Chevy Small Block build, these are worth considering.