Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 5.422in O/A Length, 0.3415in Stem

These Manley Race Series exhaust valves are built for serious performance in Chevrolet big block engines, especially those running up to 8000 RPM. They're constructed from a high-quality stainless steel, chosen for its ability to stand up to the heat and stress of racing conditions. The 1.900-inch head diameter and 5.422-inch overall length are specific dimensions designed to fit certain big block cylinder heads, and the 0.3415-inch stem diameter is standard for many performance applications.

You'll notice the chrome stems and hard tips, which add extra wear resistance where it counts, helping these valves last longer under demanding use. The under-head area is swirl polished to help smooth out airflow into the cylinder, and the combustion face is fully machined for better efficiency. These are also a recommended choice for exhaust valves in alcohol-fueled engines, showing their resilience in tough environments.