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Part #: 221439-16
The Manley NexTek Series High Performance Valve Springs are precision-engineered for Chrysler’s 6.4L 392 HEMI engines, supporting valve lifts up to .650 inches. Designed for enthusiasts and professional engine builders alike, these springs enhance valvetrain stability and durability under demanding high-performance conditions. Whether upgrading for street driving, track competition, or serious racing, these springs deliver reliable valve control at elevated RPMs and aggressive camshaft profiles.
With Manley Performance’s commitment to quality and innovation, the NexTek springs provide consistent performance and longevity, making them an essential upgrade for maximizing the potential of your Chrysler 6.4L HEMI engine.
Manley’s NexTek valve springs incorporate advanced materials and design features to optimize valvetrain function and reliability. Key highlights include:
Manley NexTek valve springs are crafted from high-quality spring steel alloys that undergo rigorous heat treatment processes to maximize durability and fatigue resistance. The tightly controlled winding process ensures uniform spring rates across all springs, providing consistent performance and reliable valve timing.
These springs are engineered to seamlessly integrate with the Chrysler 6.4L HEMI valvetrain geometry, supporting high valve lifts and aggressive cam profiles without compromising engine responsiveness or reliability. The robust construction helps maintain precise valve control even under the most demanding high-RPM conditions.
The Manley NexTek valve springs are direct replacements for the factory springs on Chrysler 6.4L 392 HEMI engines from 2011 through 2024. They fit OEM valve train components and retainers, allowing for a straightforward installation without the need for cutting, drilling, or special tuning. This makes them an excellent upgrade for performance enthusiasts seeking to enhance their engine’s capabilities with minimal modification.
Compatible vehicles include:
Manley Performance manufactures high-strength engine internals for serious builds—especially forged pistons, connecting rods, valves, and valvetrain components developed for racing and high-output street applications. If you’re building for boost, high compression, or sustained RPM, Manley is a common choice for parts engineered to take abuse and keep power reliable.
ETA stands for Estimated Time of Arrival. The date shown is calculated using our Available-to-Promise (ATP) system, which tracks real-time supplier commitments to determine when a product is expected to be available for delivery. Specifically, the date is calculated by adding 9 business days from the date a supplier has committed to ship the product, representing a worst-case scenario for when we can expect to receive inventory.
Please note: The ETA is an estimate, not a guarantee. While we work closely with our suppliers to keep dates as accurate as possible, delays due to shipping carriers, weather, customs, or supplier-side issues may occasionally push the actual arrival beyond the date shown. Likewise, inventory may arrive sooner than the ETA in many cases. If you would like to be notified for when this item arrives, sign up for our back in stock notifications!
221439-16 Manley Performance 11-24 Chrysler 300 / Dodge Challenger / Charger / Durango / Jeep Grand Cherokee / Wrangler / Ram 2500 / 3500 / Grand Wagoneer NexTek Hi-Perf Valve Spring Set .650". Manley's NexTek Series valve springs are engineered for Chrysler 6.4L HEMI engines to support valve lifts up to .650". Crafted from premium spring steel, they provide superior strength, fatigue resistance, and precise spring rates for enhanced valvetrain stability. Ideal for street, track, and racing applications, these springs reduce valve float and maintain control at high RPMs while fitting factory retainers for easy installation.
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Part #: 221439-16
The Manley NexTek Series High Performance Valve Springs are precision-engineered for Chrysler’s 6.4L 392 HEMI engines, supporting valve lifts up to .650 inches. Designed for enthusiasts and professional engine builders alike, these springs enhance valvetrain stability and durability under demanding high-performance conditions. Whether upgrading for street driving, track competition, or serious racing, these springs deliver reliable valve control at elevated RPMs and aggressive camshaft profiles.
With Manley Performance’s commitment to quality and innovation, the NexTek springs provide consistent performance and longevity, making them an essential upgrade for maximizing the potential of your Chrysler 6.4L HEMI engine.
Manley’s NexTek valve springs incorporate advanced materials and design features to optimize valvetrain function and reliability. Key highlights include:
Manley NexTek valve springs are crafted from high-quality spring steel alloys that undergo rigorous heat treatment processes to maximize durability and fatigue resistance. The tightly controlled winding process ensures uniform spring rates across all springs, providing consistent performance and reliable valve timing.
These springs are engineered to seamlessly integrate with the Chrysler 6.4L HEMI valvetrain geometry, supporting high valve lifts and aggressive cam profiles without compromising engine responsiveness or reliability. The robust construction helps maintain precise valve control even under the most demanding high-RPM conditions.
The Manley NexTek valve springs are direct replacements for the factory springs on Chrysler 6.4L 392 HEMI engines from 2011 through 2024. They fit OEM valve train components and retainers, allowing for a straightforward installation without the need for cutting, drilling, or special tuning. This makes them an excellent upgrade for performance enthusiasts seeking to enhance their engine’s capabilities with minimal modification.
Compatible vehicles include:
Manley Performance manufactures high-strength engine internals for serious builds—especially forged pistons, connecting rods, valves, and valvetrain components developed for racing and high-output street applications. If you’re building for boost, high compression, or sustained RPM, Manley is a common choice for parts engineered to take abuse and keep power reliable.
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Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.
Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.
