Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 6.380in O/A Length, 0.3415in Stem

This kit includes a set of Manley Severe Duty? exhaust valves for your Chevrolet Big Block engine. These valves are specifically crafted from XH-428 material, a unique alloy that offers exceptional strength at high temperatures, outperforming common materials like EV-8. They are designed for high-temperature gasoline engines, ensuring reliable performance when the heat is on.

Manley has put these valves through rigorous testing, including fatigue tests that simulate extreme operating conditions. In testing, these valves endured up to 100 million cycles at 40,000 psi and 1400?F, a notable improvement over competitor valves that failed much sooner. The design includes swirl-polished under-head areas and fully machined combustion faces to help improve airflow and combustion efficiency. For added durability, they feature chrome stems and hard tips.

With a 1.900-inch head diameter, 6.380-inch overall length, and a 0.3415-inch stem diameter, these valves are a solid option for rebuilding or upgrading your engine's top end. Remember to consult your engine's service manual for proper installation procedures and any other components you might need for your rebuild.