Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.065in O/A Length, 0.3415in Stem

If you're rebuilding the top end of a high-performance Small Block Chevy engine, especially one destined for serious competition like drag racing or marine use, you need exhaust valves that can handle extreme heat and pressure. These Manley Extreme Duty Series valves are built specifically for those demanding scenarios. They are crafted from Manley's XH-432 XtremeAlloy, a material chosen for its exceptional resistance to the intense conditions found in Top Fuel, Funny Car, and high-output marine engines. This isn't your average valve; it's designed to keep performing when others would fail.

Beyond the advanced alloy, these valves feature chrome-plated stems and hardened tips. This combination is key for longevity, providing excellent wear resistance against valve guides and rocker arms, which is crucial in high-RPM, high-stress environments. The under-head area is swirl polished to help smooth the flow of exhaust gases out of the cylinder, while the fully machined combustion face ensures optimal efficiency. These details contribute to improved airflow and better combustion, helping your engine make the most power it can.

When you're pushing an engine to its limits, every component matters. These Manley valves are a solid choice for builders who need reliability and performance under extreme conditions. They are designed to fit right into a properly prepared Small Block Chevy cylinder head, but always refer to the manufacturer's installation instructions for specific details on fitting and setup.