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Manley 26382538KS
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Manley Super Finished NexTek H.P. Valve Spring Kit 7 Degree Titanium Retainers GM LS-series


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Manley Super Finished NexTek H.P. Valve Spring Kit 7 Degree Titanium Retainers GM LS-series $541.99
Out of stock
NexTek H.P. Valve Spring Kit
  • GM LS-series
  • 1.311'' O.D.
  • 0.650'' I.D.
  • 353 lbs./in. Spring Rate
  • 150 @ 1.800'' / 375 @ 1.150''
  • 0.650'' Max Valve Lift
  • Single Conical Ovate Wire
  • +.050" 7° Titanium Retainer
  • Viton Valve Seals
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    Manley 26382538KS Details

    GM LS-Series

    GM LS-series, LT-1 / LT-4 / L-98 high performance hydraulic roller applications

    Valve Spring Specs: p/n 660-221438-16

    • Type of Spring: Super Finished Single Conical Ovate Wire
    • Color Code: N/A
    • Installed Height and Pressure: 1.800'' @ 150 lbs./in.
    • Open Height and Pressure: 1.150'' @ 375 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: 73 grams
    • Damper Included: No
      Click Here to see 660-221438 Valve Spring Load Chart

    Valve Spring Retainer Specs: p/n 660-23620-16

    • 7° Titanium Retainers
    • Works with 1.076'' Spring O.D.
    • Spring Type Design: Single / Double
    • Retainer O.D.: 0.935''
    • Retainer I.D. #1: 0.640''
    • Retainer I.D. #2: 0.570"
    • Retainer I.D. #3: N/A
    • Installed Height: +.050"
    • Keeper Degree: 7° x 8mm Valve Stem
    • Weight: 5 Grams

    I.D. Valve Spring Locators Specs: p/n 660-42338-16

    • Fits Spring O.D.: 1.311" maximum
    • Locator O.D.:1.290"
    • Locator I.D.: 0.505"
    • Locator Thickness: 0.035"
    • Wall Shoulder Height: 0.145"
    • Shoulder Diameter: 0.875"

    Valve Lock Specs: p/n 660-13098-16

    • Material: Machined Steel
    • Lock Angle: 7°
    • Valve Stem Diameter: 8mm (.3135'')
    • Installed Height: Standard
    • Valve Stem Groove Type: Single Radius
    • Weight: 2.6 grams

    Valve Stem Seal Specs: p/n 660-24042-8 (x2)

    • Material: Viton
    • Valve Stem Diameter: 5/16" / 8mm
    • Guide O.D.: 0.500"
    • Installed Seal O.D.: 0.608"
    • Cutter # Required (not included): p/n 660-41610

    Better By Design

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


    • Manufactured from HiTensile Chrome Silicon steel
    • Shotpeened to MIL Specs for maximum fatigue life
    • Proprietary multi-step 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
    • Available in Polished and Super Finished versions to reduce friction, improve fatigue life and minimize load loss
    • Super Finished is a multi-step surface enhancement that significantly improves fatigue strength

      Click Here to see Valve Springs Load Chart

    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.