Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.265in O/A Length, 0.3415in Stem

These Manley Race Series exhaust valves are built from XH-426 stainless steel, a material chosen for its ability to handle the heat and stress found in high-performance engines. They measure 1.625 inches across the head and are 5.265 inches from end to end, with a 0.3415-inch stem diameter, making them a solid choice for many Chevrolet Small Block applications.

You'll notice the chrome stems and hard tips, which are there to improve wear resistance and extend the life of the valve. Manley also swirl polishes the area under the head and fully machines the combustion face. This attention to detail helps optimize airflow into the cylinder, which can contribute to better combustion efficiency. They're even recommended for alcohol-fueled engines, showing they can handle demanding conditions.

If you're rebuilding the top end of your engine and need reliable exhaust valves, these are a well-built option. They are designed for engines operating under 8000 RPM, so keep that in mind for your build.