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Manley Ford 4.6L/5.4L SOHC NexTek Series Street/Strip 1.125 Valve Springs (2 valves per cylinder

SKU: MAN221427-16

Valve Springs

MAN Valve Spring Kits...

Manley Ford 4.6L/5.4L SOHC NexTek Series Street/Strip 1.125 Valve Springs (2 valves per cylinder

SKU: MAN221427-16

Valve Springs

MAN Valve Spring Kits...

A$697.65
Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.
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Description

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.

Part Type

Engine Valve Spring Kit

Data: v4.2 - Upd: 2026-10-13 17:07:31

Features

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

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
221427-16
Product Attributes - Part Type
Valve Springs
Product Attributes - Product Line
Manley NexTek Valve Springs
Product Attributes - UPC
807298023991
Product Attributes - Valve Spring Style
Standard
Product Attributes - Number of Springs Per Valve
Single
Product Attributes - Maximum Valve Lift (in.)
0.580 in.
Product Attributes - Retainers Included
No
Product Attributes - Outside Diameter of Outer Spring (in.)
1.125 in.
Product Attributes - Coil Bind Height (in.)
1.080 in.
Product Attributes - Damper Spring Included
No
Product Attributes - Spring Rate (lbs./in.)
264 lbs./in.
Product Attributes - Inside Diameter of Outer Spring (in.)
0.748 in.
Product Attributes - Locks Included
No
Product Attributes - Valve Stem Seals Included
No
Product Attributes - Valve Springs Coated
No
Product Attributes - Remanufactured
No
Product Attributes - Quantity
Sold as a set of 16.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man221427-16
SFX Item ID 4060830
Supplier Item Code 4060830
Manufacturer SKU 221427-16
Manufacturer UPC 807298023991
Alternative References 4.6L/5.4L

Compatibility

Application Data
  • MakeFORD
    Beginning Year1992
    Ending Year2014
    Engine TypeV8
    Engine FamilyFord modular V8
    Engine Size4.6L/281
    Installed Height (in.)1.680 in.
    Seat Pressure at Installed Height (lbs.)95 lbs.
    Open Height (in.)(application)1.130
    Open Pressure (lbs.)240 lbs.
  • MakeFORD
    Beginning Year1997
    Ending Year2016
    Engine TypeV8
    Engine FamilyFord modular V8
    Engine Size5.4L/330
    Installed Height (in.)1.680 in.
    Seat Pressure at Installed Height (lbs.)95 lbs.
    Open Height (in.)(application)1.130
    Open Pressure (lbs.)240 lbs.
  • MakeFORD
    Beginning Year2010
    Ending Year2021
    Engine TypeV8
    Engine FamilyFord modular V8
    Engine Size6.2L/379
    Installed Height (in.)1.680 in.
    Seat Pressure at Installed Height (lbs.)95 lbs.
    Open Height (in.)(application)1.130
    Open Pressure (lbs.)240 lbs.

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