Manley 12739-8 Extreme Duty Exhaust Valve Big Block Chevy - Set 1.900 Stainless

The Manley 12739-8 Extreme Duty Exhaust Valve Set delivers professional-grade performance for demanding Big Block Chevrolet applications. Engineered with XH-432 XtremeAlloy stainless steel construction, these exhaust valves are built to withstand the extreme forces and temperatures found in Top Fuel, Funny Car, marine, and high-performance racing engines.

Key Features:

• 1.900" head diameter x 5.522" overall length
• .3415" stem diameter for precise fitment
• XH-432 XtremeAlloy stainless steel construction for superior heat resistance
• Chrome-plated stems with hard tips for exceptional longevity and wear resistance
• Swirl polished under-head areas for optimized airflow
• Fully machined combustion faces for improved combustion efficiency
• O.E. style radius keeper grooves for reliable installation

Manley's Extreme Duty Series represents the pinnacle of valve technology, specifically designed for applications requiring maximum durability under extreme conditions. Whether you're building a competition drag engine, high-performance marine engine, or circle track powerplant, these valves provide the reliability and performance demanded by professional engine builders and racers worldwide.