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Manley Performance

Manley Ford 4.6L/5.4L SOHC NexTek Series High Performance Valve Springs (2 valves per cylinder)

Manufacturer part number: 221437-16

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CODE: MAN221437-16
$405.78
$365.20 Backorder — not currently in stock Sold out
BACKORDER — not currently in stock

This item is on backorder. A shipping date is not confirmed. Contact us for current lead time: 609-249-4921.

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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
1997-2000 Ford F-150 Base
2002-2003 Ford F-150 Harley-Davidson Edition
1999-2003 Ford F-150 Lightning
1996-2004 Ford Mustang GT