Manley GM 6.6L Duramax Diesel Exhaust Valve Kit 1.300in Head Dia. 4.985in O/A Length, 0.2735in Stem

Manley Performance Products is well-known for building serious performance parts, often for the most demanding racing applications. This Extreme Duty Series exhaust valve kit is a prime example, designed to handle the intense heat and forces found in applications like Top Fuel drag racing and high-performance marine engines. If your GM 6.6L Duramax Diesel needs an exhaust valve that can stand up to extreme conditions, this is a solid option.

The heart of these valves is Manley's XH-432 XtremeAlloy material, specifically chosen for its exceptional heat and force resistance. To further enhance durability and longevity, they feature chrome stems and hard tips, which are crucial for resisting wear in high-stress environments. You'll also find swirl polished under-head areas and fully machined combustion faces. These details aren't just for show; they're designed to improve airflow into the combustion chamber and contribute to better combustion efficiency, ultimately helping your engine perform at its best under pressure.

This kit includes exhaust valves with a 1.300-inch head diameter, a 4.985-inch overall length, and a 0.2735-inch stem diameter. While these valves are built for extreme duty, it's always a good idea to consult your engine's service manual or a trusted mechanic for specific installation procedures and any other components you might need for a complete top-end rebuild.