Manley Performance MAN221431-16 NexTek Valve Spring, Single Hemi

From drag strips to short track and endurance circuits, the Manley NexTek® series is engineered for serious racers. NexTek® springs resist pressure loss and valve-train degradation even in the most demanding race conditions. That means more consistent spring force deep into a run, reduced valve bounce, and improved overall stability for high-RPM performance. Built to outperform and outlast in real-world competition. Manley Valve Spring, SPRING-1.311 SINGLE HEMI.

• Tightly controlled open-end flatness reduces valve stem side loading
• Manufactured from “super clean” Hi-Tensile Chrome Silicon steel
• Proprietary multi-step heat treating minimizes load loss
• Tip thickness designed to eliminate overload breakage
• Shot-peened to MIL spec for max fatigue life

The Manley Performance MAN221431-16 NexTek valve spring is engineered for serious racing applications, from drag strips and short tracks to endurance circuits. Designed to maintain consistent spring force under demanding race conditions, it helps reduce valve bounce and support valve-train stability during high-RPM operation.

Key Features & Performance Benefits

• Consistent spring force: NexTek technology is designed to resist pressure loss during demanding racing conditions.
• Reduced valve-train degradation: Proprietary multi-step heat treating minimizes load loss over time.
• Improved valve-train stability: Consistent performance helps reduce valve bounce during high-RPM operation.
• Enhanced fatigue life: Shot peening to MIL specification supports durability in competition use.

Key Product Specifications & Technical Data

• Brand: Manley Performance
• Part number: MAN221431-16
• Product type: Valve spring
• Series: NexTek
• Configuration: Single Hemi
• Material: Hi-Tensile Chrome Silicon steel
• Manufacturing treatment: Proprietary multi-step heat treating
• Surface treatment: Shot-peened to MIL specification

What's Included

One Manley Performance NexTek single Hemi valve spring.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1