Manley Ford 4.6L/5.4L DOHC NexTek Series High Performance Valve Springs (4 valves per cylinder)
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.
- 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
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2005-2006 | Ford | GT | Base |
| 2007-2008 | Ford | Mustang | Shelby GT500 |
| 1999,2001 | Ford | Mustang | SVT Cobra |
| 2000 | Ford | Mustang | SVT Cobra R |
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