Manley 12345-1 Race Master Exhaust Valve LT1 6.2L 1.590 Head 8mm Stem

The Manley 12345-1 Race Master exhaust valve is precision-engineered for GM LT1 6.2L Gen V engines, delivering exceptional performance for bracket racing, oval track, and high-performance street applications operating below 8000 RPM. This individual valve features a 1.590-inch head diameter with an 8mm (0.3136-inch) stem diameter and stock overall length of 5.205 inches.

Premium Construction and Features:

• Manufactured from XH-426 stainless steel for superior durability and heat resistance
• Hard chrome plated stems provide enhanced wear resistance and longevity
• Hardened valve tips exceed competitor specifications for extended valve train life
• Swirl polished underhead areas optimize exhaust flow dynamics
• Fully machined combustion faces ensure consistent sealing and performance
• 25-degree x 7/16-inch underhead angle/radius for improved flow characteristics
• 18-degree dish top of head design
• 0.075-inch margin with 0.100-inch seat width

Manley Performance has been the industry standard for racing valves for over 50 years, trusted by professional engine builders in NASCAR, drag racing, and road racing. Each valve undergoes rigorous quality control to meet the demanding specifications required for competitive motorsports and serious street performance builds.