Manley 11570-8 Severe Duty Intake Valve 2.020in Head NK-844 Stainless Steel

The Manley 11570-8 is a Severe Duty Series performance intake valve engineered for high-performance and race engine applications. Manufactured from premium NK-844 stainless steel with a chrome-plated stem and hardened tip, this valve is built to withstand the extreme temperatures and pressures of competition use. Each valve is swirl polished and fully machined for optimal flow and consistency.

Key Features:

• Constructed from NK-844 stainless steel for superior heat and corrosion resistance
• Chrome-plated stem for enhanced wear resistance and durability
• Hardened valve tip to withstand repeated rocker arm contact
• Swirl polished and fully machined for precise fitment and improved flow
• Straight stem design for increased durability under high-stress conditions
• Installed height runs 0.100 in. longer than stock for performance tuning flexibility
• Lightweight at 113 grams per valve to reduce valvetrain inertia

Specifications:

• Valve Type: Intake
• Head Diameter: 2.020 in.
• Stem Diameter: 0.3415 in. (11/32)
• Overall Length: 5.015 in.
• Installed Height: +0.100 in. over stock
• Tip Length: 0.250 in.
• Underhead Angle/Radius: 10 degrees x 3/8 in.
• Margin: 0.070 in.
• Seat Width: 0.080 in.
• Top of Head: 7-degree dish
• Weight: 113 grams per valve

The Manley Severe Duty Series is a trusted choice among professional engine builders and performance enthusiasts who demand reliability and precision in demanding race environments.