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Manley Performance

Manley Performance

Manley NexTek Valve Springs 221438-1 Springs, Single, 1.311 in. Outside Diameter, 353 lbs./in. Rate, 1.100 in. Coil Bind Height, Each

SKU: MAN221438-1

Valve Springs
Manley NexTek Valve Springs 221438-1 Springs, Single, 1.311 in. Outside Diameter, 353 lbs./in. Rate, 1.100 in. Coil Bind Height, Each
Manley Performance

Manley Performance

Manley NexTek Valve Springs 221438-1 Springs, Single, 1.311 in. Outside Diameter, 353 lbs./in. Rate, 1.100 in. Coil Bind Height, Each

SKU: MAN221438-1

Valve Springs
A$58.47
BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.
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Description

These Manley NexTek valve springs are better-designed valve springs using state-of-the-art machinery for purpose-built racing engines. They're manufactured from super-clean, high-tensile chrome silicon steel and are shot-peened to MIL specs for maximum fatigue life. They feature a proprietary, multi-step heat-treating that minimizes load loss and have computer-aided modeling to minimize valve bounce and valve gear separation. The Manley NexTek valve springs are smaller diameter and lightweight, allowing engines to rev higher faster. They have an extended tip thickness designed to eliminate overload breakage, and their tightly controlled open-end flatness reduces valve stem side loading.

Part Type

Valve Springs

Data: v4.2 - Upd: 2026-10-14 17:10:12

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
221438-1
Product Attributes - Part Type
Valve Springs
Product Attributes - Product Line
Manley NexTek Valve Springs
Product Attributes - UPC
807298016566
Product Attributes - Valve Spring Style
Beehive
Product Attributes - Number of Springs Per Valve
Single
Product Attributes - Maximum Valve Lift (in.)
0.600 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 individually.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man221438-1
SFX Item ID 4928328
Supplier Item Code 4928328
Manufacturer SKU 221438-1
Manufacturer UPC 807298016566

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1997
    Ending Year2004
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size5.7L/350
    Installed Height (in.)1.800 in.
    Seat Pressure at Installed Height (lbs.)150 lbs.
    Open Height (in.)(application)1.150
    Open Pressure (lbs.)375 lbs.
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2014
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size5.3L/325
    Installed Height (in.)1.800 in.
    Seat Pressure at Installed Height (lbs.)150 lbs.
    Open Height (in.)(application)1.150
    Open Pressure (lbs.)375 lbs.
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2017
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size4.8L/294
    Installed Height (in.)1.800 in.
    Seat Pressure at Installed Height (lbs.)150 lbs.
    Open Height (in.)(application)1.150
    Open Pressure (lbs.)375 lbs.
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2019
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size6.0L/364
    Installed Height (in.)1.800 in.
    Seat Pressure at Installed Height (lbs.)150 lbs.
    Open Height (in.)(application)1.150
    Open Pressure (lbs.)375 lbs.
  • MakeCHEVROLET
    Beginning Year2006
    Ending Year2015
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size7.0L/427
    Installed Height (in.)1.800 in.
    Seat Pressure at Installed Height (lbs.)150 lbs.
    Open Height (in.)(application)1.150
    Open Pressure (lbs.)375 lbs.
  • MakeCHEVROLET
    Beginning Year2008
    Ending Year2017
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size6.2L/376
    Installed Height (in.)1.800 in.
    Seat Pressure at Installed Height (lbs.)150 lbs.
    Open Height (in.)(application)1.150
    Open Pressure (lbs.)375 lbs.

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