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Manley 221421-16

Polished NexTek H.P. Valve Springs GM LS-series

Manley 221421-16
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Estimated ship date 12/18/17 if Ordered Today
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Manley 221421-16 Polished NexTek H.P. Valve Springs GM LS-series $351.99
NexTek H.P. Valve Springs
  • GM LS-series
  • 1.324'' O.D.
  • 0.676'' I.D.
  • 435 lbs./in. Spring Rate
  • 165 @ 1.800'' Installed
  • 515 @ 1.000'' Open
  • 0.800'' Max Valve Lift
  • 0.900'' Coil Bind
  • Double Spring (No Damper)
  • 16/pkg.

  • Manley 221421-16 Details

    GM LS-Series

    GM LS-series high performance hydraulic roller applications

  • Type of Spring: Polished Double Coil without Damper
  • Color Code: N/A
  • Installed Height and Pressure: 1.800'' @ 165 lbs./in.
  • Open Height and Pressure: 1.000'' @ 515 lbs./in.
  • Spring Rate: 435 lbs./in.
  • O.D. of Outer Spring: 1.324''
  • I.D. of Outer Spring: 0.920''
  • I.D. of Middle Spring: N/A
  • I.D. of Inner Spring: 0.676''
  • Coil Bind height: 0.900''
  • Weight: 90 grams
  • Damper Included: No

    Click Here to see 660-221421 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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