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Manley 221431-16

Super Finished NexTek H.P. Valve Springs 5.7/6.1L HEMI

Manley 221431-16
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Estimated ship date 01/31/18 if Ordered Today
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Manley 221431-16 Super Finished NexTek H.P. Valve Springs 5.7/6.1L HEMI $328.99
NexTek H.P. Valve Springs
  • 5.7/6.1L HEMI
  • 1.311'' O.D.
  • 0.650'' I.D.
  • 353 lbs./in. Spring Rate
  • 145 @ 1.811'' Installed
  • 370 @ 1.161'' Open
  • 0.650'' Max Valve Lift
  • 1.100'' Coil Bind
  • Single Conical Ovate Wire
  • 16/pkg.

  • Manley 221431-16 Details

    Chrysler 5.7L/6.1L HEMI

    Chrysler 5.7L/6.1L HEMI high performance hydraulic roller applications. *Note: These Chrysler Hemi springs come with shims which are ONLY needed for 6.1L applications on the intake side in order to achieve the correct installed height. Each set also includes a set of piloting rings that install over the factory ''Top Hat'' integral valve seal to properly locate the I.D. of the spring on early 5.7L (thru 2008) and 6.1L applications. P/N 221431X-16 which does not include any shims or piloting rings is also available for the Hemi Drag Pak engines.

  • Type of Spring: Super Finished Single Conical Ovate Wire
  • Color Code: N/A
  • Installed Height and Pressure: 1.811'' @ 145 lbs./in.
  • Open Height and Pressure: 1.161'' @ 370 lbs./in.
  • Spring Rate: 353 lbs./in.
  • O.D. of Outer Spring: 1.076'' Top / 1.311'' Bottom
  • I.D. of Outer Spring: 0.650'' Top / 0.885'' Bottom
  • I.D. of Middle Spring: N/A
  • I.D. of Inner Spring: N/A
  • Coil Bind height: 1.100''
  • Weight: 72 grams
  • Damper Included: No

    Click Here to see 660-221431 Valve Spring Load Chart

  • Specifications:

    Manufacturer's Part Number:

    NexTek Valve Springs...Better By Design!

    Manley NexTek (Next Generation) Valve Springs were developed over a decade ago and still offer unequaled performance. The NexTek springs were developed to satisfy the demands of top level engine builders who demanded the absolute highest quality valve springs. Manley Nextek springs can be found in drag race applications ranging from Bracket racers to Top Fuel, in oval track engines across the country on the street and strip.

  • Manufactured from ''super clean'' HiTensile Chrome Silicon steel
  • Shotpeened to MIL Specs for maximum fatigue life
  • Proprietary multistep heat treating minimizes load loss
  • Tightly controlled open end flatness reduces valve stem side loading
  • Tip thickness designed to eliminate overload breakage
  • Specially processed premium-grade chrome silicon that is virtually free of impurities or surface irregularities
  • These Manley NexTek valve springs are available in Polished and Super Finished versions to reduce friction, improve fatigue life and minimize load loss
  • Super Finished is multi-step surface enhancement that significantly improves fatigue strength

    Click Here to see Valve Springs Load Chart

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