Manley Chevrolet Big Block Exhaust Valve Kit - 1.850in Head Dia. 5.500in O/A Length, 0.3415in Stem

Manley Performance is well-known for making strong internal engine components, and their Severe Duty? Exhaust Valves are a prime example. If you're rebuilding the top end of a Chevrolet Big Block engine, these valves are built to handle the heat and stress of high-performance gasoline applications. They are designed to be a direct replacement for your stock exhaust valves, ensuring a proper fit during installation.

These exhaust valves are crafted from XH-428 material, which Manley states has nearly double the ultimate tensile strength at 1500°F compared to other common exhaust valve materials. They've also undergone rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400°F, which is significantly more than many competitor valves. The chrome stems and hard tips add to their durability, while the swirl-polished under-head areas and fully machined faces help improve airflow into the combustion chamber.

This kit includes exhaust valves with a 1.850-inch head diameter and a 5.500-inch overall length, featuring a 0.3415-inch stem diameter. For optimal engine performance, it's always a good idea to ensure your valve guides and seats are in good condition before installing new valves.