Manley Chevrolet Big Block Exhaust Valve Kit - 1.880in Head Dia. 5.522in O/A Length, 0.3415in Stem

When you're rebuilding a high-performance Big Block Chevy engine, especially for demanding applications like marine use or serious drag racing, the right valves make a huge difference. This kit from Manley Performance includes their Extreme Duty Series exhaust valves, designed to handle extreme force and heat. You get a set of exhaust valves, each featuring a 1.880-inch head diameter and a 5.522-inch overall length, with a 0.3415-inch stem diameter. These aren't your average valves; they're built for engines that push the limits.

The heart of these valves is Manley's XH-432 XtremeAlloy material, chosen specifically for its ability to withstand intense heat and stress found in applications like Top Fuel dragsters and high-output marine engines. To ensure they stand up to the rigors of operation, these valves are equipped with chrome stems and hard tips, which significantly boosts their wear resistance and longevity. You'll also notice the swirl polished under the head areas and fully machined combustion faces. This design work isn't just for looks; it helps improve airflow into the cylinder and contributes to more efficient combustion, which is crucial for getting the most out of your engine.

If you're building an engine that needs to perform under extreme conditions, these Manley valves are a solid choice. They are designed to be a direct replacement for stock valves in many Big Block Chevy applications, but always double-check your specific engine build and requirements. Make sure you have all the necessary components for your rebuild, as this kit includes the exhaust valves themselves.