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

If you're rebuilding the top end of your Chevrolet Big Block engine, especially for racing applications under 8000 RPM, these Manley Race Series exhaust valves are a solid option. They are built from high-quality stainless steel, which is crucial for handling the heat and stress inside the combustion chamber. The specific material used for the exhaust valves is XH-426, known for its resilience.

Manley has put a lot of thought into the details here. The stems are chromed for better wear resistance, and the under-head areas are swirl polished to help improve airflow into the cylinder. The combustion faces are also fully machined, which helps optimize how the fuel and air mixture burns. These are also the recommended exhaust valves if you're running an alcohol-based fuel, as they're built to handle those conditions reliably.

This kit includes exhaust valves with a 1.900-inch head diameter and a 5.522-inch overall length, with a 0.3415-inch stem diameter. Remember to check the manufacturer's installation instructions for proper fitment and setup during your rebuild.