Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.522in O/A Length, 0.3415in Stem

Manley Performance is well-known for making strong internal engine components, especially for racing applications. This exhaust valve kit is a prime example, designed for Chevrolet Big Block engines. These valves are crucial for managing the hot exhaust gases leaving your cylinders, and Manley has put a lot of thought into making them last under tough conditions.

What really sets these valves apart is the XH-428 material Manley uses for the exhaust side. They've tested it extensively, showing it can handle over 100 million cycles at high temperatures and stress levels, which is about 1000 times more than some other valves can manage. They also feature chrome stems and hard tips to resist wear, and the under-head area is swirl-polished to help improve airflow into the combustion chamber. The fully machined faces ensure a good seal against the valve seat.

If you're building a high-temperature gasoline engine, whether for the street or the track, these valves are a solid option. They are designed to handle the heat and stress that come with performance engines, offering improved durability and reliability.