Manley NexTek 221428-16 Single Valve Springs 1.311

Manley designed these NexTek 221428-16 Single Valve Springs for drag racing, oval track as well as high-performance street applications.

Manufactured from “super clean” Hi-Tensile Chrome Silicon steel wire, they are also shot-peened to MIL spec for maximum fatigue life. Manley’s proprietary multi-step heat treating minimizes load loss, while the tip thickness is designed to eliminate overload breakage. Computer-aided modeling and design minimizes valve bounce as well as valve gear separation, and tightly controlled open end flatness reduces valve stem side loading.

Manley NexTek 221428-16 Single Valve Springs Specs:

• Number of Springs Per Valve: Single
• Valve Spring Style: Beehive
• Maximum Valve Lift: 0.600 in.
• Installed Height and Pressure: 1.800 in. @ 150 lbs./in.
• Open Height and Pressure: 1.200 in. @ 355 lbs./in.
• Coil Bind Height: 1.085 in.
• Outside Diameter of Outer Spring: 1.311 in. Bottom, 1.076 in. Top
• Inner Diameter of Outer Spring: 0.885 in. Bottom, 0.650 in. Top
• Middle Spring ID: N/A
• Inner Spring ID: N/A
• Spring Rate: 341 lbs./in.
• Damper Spring Included: No
• Retainers Included: No
• Valve Springs Coated: No
• Valve Stem Seals Included: No
• Locks Included: No
• Quantity: Sold as a set of 16

Manley NexTek Series Valve Springs –Better By Design!