Manley 6.6 Duramax Race Series Intake Valve Kit | 2001-2016 GM Duramax 6.6L

Manley’s Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM

• Stainless Steel Construction: Both exhaust (XH-426) and intake (NK-842) valves are constructed from high-quality stainless steel for unparalleled durability.
• Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity and wear resistance.
• Swirl Polished and Fully Machined: The valves feature swirl polished under head areas and fully machined combustion faces to optimize airflow and combustion efficiency.
• Variety of Shapes: Choose between Race Master (Straight Stem) and Race Flo shapes to suit your racing engine’s specific requirements.
• Recommended for Alcohol Engines: These valves are the recommended choice for exhaust valves in alcohol engines, ensuring reliable performance even in demanding conditions.

Specs:

• Head Diameter: 1.338 IN
• Stem Diameter: 0.274 IN
• O/A Length: 4.985 IN
• Tip Length: 0.480 IN
• Margin Width: 0.050 IN
• Seat Width: 0.085 IN
• Top Of Head: Flat Face
• Underhead Angle: 25.00 DEG
• Underhead Radius: 9/32 IN
• Valve Quantity: 8