Manley 11668-8 Race Series 2.080" Intake Valves Set of 8 for 6.1L HEMI

Vehicle Fitment

• 2005-2010 Chrysler 300C SRT-8 with 6.1L HEMI
• 2006-2008 Dodge Magnum SRT-8 with 6.1L HEMI
• 2006-2010 Dodge Charger SRT-8 with 6.1L HEMI
• 2006-2010 Jeep Grand Cherokee SRT-8 with 6.1L HEMI

Features

• Stainless steel construction (NK-842 material) for race-duty durability
• Intake valve head diameter: 2.080" (approx 52.83 mm)
• Stem diameter: 0.3125" (≈7.94 mm) for high performance valvetrain clearance
• Overall valve length: 4.990" (≈126.75 mm) matched to factory ported head dimensions
• Tip length: 0.120" (≈3.05 mm) for consistent retainer fitment
• Swirl-polished under-head radii and fully machined faces to optimise airflow
• Valve margin width: 0.050"; seat width: 0.085"; top of head: 5° dish - engineered for high RPM performance
• Designed for bracket, drag and oval-track racers operating up to ~8000 RPM

Specifications

• Part Number: 11668-8
• Valve Type: Intake (set of 8)
• Head Diameter: 2.080"
• Stem Diameter: 0.3125"
• Overall Length: 4.990"
• Tip Length: 0.120"
• Valve Margin Width: 0.050"
• Seat Width: 0.085"
• Top of Head: 5° dish
• Under-head Angle/Radius: 10° x 5/16"
• Material: NK-842 stainless steel (intake valve material)

Included Components

• 1x Manley 11668-8 Race Series Intake Valve Kit (Set of 8 valves)

Product Description

The Manley 11668-8 Race Series intake valve kit is engineered specifically for the 6.1L HEMI engine family found in several high-performance Chrysler, Dodge and Jeep SRT-8 models. With a large 2.080" valve head diameter, the kit significantly enhances airflow potential compared to standard valves, making it ideal for high-RPM, high-boost or track oriented builds.

Constructed from high-grade NK-842 stainless steel, the valves feature hardened tips, chrome-coated stems, and enhanced flow geometry through swirl-polished under-head radii and fully machined combustion faces. These features deliver robust durability and consistent performance under heavy loads and elevated RPM.

Installation of this valve kit is suitable for engine builders and enthusiasts upgrading for performance or track use. Although designed to match factory geometry for 6.1L HEMI heads, it is vital to verify valve guide condition, seat and margin clearances, and retainer/lock compatibility before use - particularly in high RPM or forced induction applications.