Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.265in O/A Length, 0.3415in Stem

These Manley Race Series exhaust valves are built from XH-426 stainless steel, a strong material chosen for its ability to handle the heat and stress inside a performance engine. With a 1.600-inch head diameter and a 5.265-inch overall length, they are specifically sized for Chevrolet Small Block engines, and the 0.3415-inch stem diameter ensures a good fit with most common valve guides.

Manley has added chrome stems and hard tips to these valves, which helps them stand up to wear over time, especially in engines that see a lot of use. The under-head area is swirl polished to help smooth airflow into the cylinder, and the combustion face is fully machined. These details matter for getting the most out of your engine, particularly if you're running it at speeds up to 8000 RPM, like in bracket, drag, or oval track racing.

If you're building an engine that will run on alcohol, these are a recommended choice for exhaust valves. They are designed to hold up under those specific operating conditions. You can choose between a straight stem (Race Master) or a Race Flo shape to best suit your engine's airflow needs.