Manley Chevrolet Small Block Exhaust Valve Kit - 1.600in Head Dia. 5.165in O/A Length, 0.3415in Stem

If you're rebuilding the top end of a Chevrolet Small Block engine, these Manley Race Series exhaust valves are a solid option. They're built from stainless steel, which is a good choice for handling the heat and stress inside the combustion chamber. The exhaust valves are specifically made from XH-426 stainless steel, known for its strength and resistance to high temperatures.

Manley has put some thought into optimizing airflow with these valves. They feature swirl-polished areas under the head and fully machined combustion faces. This helps gases move more freely and can contribute to better combustion efficiency. The stems are chrome-plated and have hard tips, which adds to their wear resistance and should help them last longer, especially in engines that see a lot of use or operate at higher RPMs, up to 8000 RPM.

These valves are also recommended for use in alcohol-fueled engines, which tend to run hotter and require more robust components. If you're working on a performance build for drag racing, bracket racing, or oval track, these are designed to hold up under those conditions.