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Manley Performance

Manley Performance

Manley Springs Single Hemi

SKU: MAN221431-16

Valve Springs

MAN Valve Spring Kits...

Manley Springs Single Hemi
Manley Performance

Manley Performance

Manley Springs Single Hemi

SKU: MAN221431-16

Valve Springs

MAN Valve Spring Kits...

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A$777.43 A$958.82
LOW STOCK! Est Ship 4-7 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.
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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: 2026-10-17 00:10:22

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
221431-16
Product Attributes - Part Type
Valve Springs
Product Attributes - Product Line
Manley NexTek Valve Springs
Product Attributes - UPC
807298061160
Product Attributes - Valve Spring Style
Beehive
Product Attributes - Number of Springs Per Valve
Single
Product Attributes - Maximum Valve Lift (in.)
0.650 in.
Product Attributes - Retainers Included
No
Product Attributes - Outside Diameter of Outer Spring (in.)
1.311 in.
Product Attributes - Coil Bind Height (in.)
1.100 in.
Product Attributes - Damper Spring Included
No
Product Attributes - Spring Rate (lbs./in.)
353 lbs./in.
Product Attributes - Inside Diameter of Outer Spring (in.)
0.885 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 man221431-16
SFX Item ID 4060999
Supplier Item Code 4060999
Manufacturer SKU 221431-16
Manufacturer UPC 807298061160

Compatibility

Application Data
  • MakeCHRYSLER
    Beginning Year2005
    Ending Year2010
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size6.1L/370
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.
  • MakeCHRYSLER
    Beginning Year2005
    Ending Year2021
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size5.7L/345
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.
  • MakeDODGE
    Beginning Year2003
    Ending Year2021
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size5.7L/345
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.
  • MakeDODGE
    Beginning Year2006
    Ending Year2010
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size6.1L/370
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.
  • MakeJEEP
    Beginning Year2005
    Ending Year2021
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size5.7L/345
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.
  • MakeJEEP
    Beginning Year2006
    Ending Year2010
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size6.1L/370
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.
  • MakeRAM
    Beginning Year2011
    Ending Year2021
    Engine TypeV8
    Engine FamilyMopar Hemi Gen III
    Engine Size5.7L/345
    Installed Height (in.)1.811 in.
    Seat Pressure at Installed Height (lbs.)146 lbs.
    Open Height (in.)(application)1.161
    Open Pressure (lbs.)371 lbs.

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