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K-Motion K-900

M-400 Valve Spring Set Double Spring with Damper

K-Motion K-900


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K-Motion K-900 M-400 Valve Spring Set Double Spring with Damper $288.99
M-400 Valve Spring Set
  • Double Spring with Damper
  • 1.550'' OD (1.100'' Outer ID)
  • 0.717'' ID
  • 312 @ 1.850'' Seat Pressure
  • 727 @ 1.200'' Open Pressure
  • 621 lbs/in Spring Rate
  • .700'' Max Valve Lift
  • 1.090'' Coil Bind
  • 16/pkg

  • Specifications:

    Coil Bind Height (in.)
    Damper Spring Included
    Inside Diameter of Inner Spring (in.)
    Inside Diameter of Outer Spring (in.)
    Number of Springs Per Valve
    Outside Diameter of Outer Spring (in.)
    Sold as a set of 16
    Spring Rate
    579 lbs./in.
    Valve Spring Style
    Manufacturer's Part Number:

    The Overwhelming Choice of Racers!

    K-Motion Valve Springs deliver the high quality and superior dependability required to meet their performance requirements. K-Motion starts with the highest quality wire available. All alloys used are manufactured and inspected to the highest industry standards. Quality wire is the first essential step in manufacturing springs designed for extreme, high, aggressive cam lifts and ramp speeds.

    Metallurgists measure a material's resistance to failure with fracture toughness. This, combined with the material's strength, determines whether or not a material is a suitable choice for a specific application. This is why K-Motion Valve Springs utilize four different alloys. For each application, only the proper material is selected. After coiling, springs receive a variety of carefully controlled heat treatment and surface finishing processes. The intent is to reduce load loss and increase spring life. Each spring is visually inspected for surface imperfections, which could lead to early breakage, and dampers are radius ground and depointed for longer spring life.

    Each valve spring assembly is cold pressed with as much as 2500 pounds of pressure, based on application. A pink stripe is added for identification, and then each spring is individually pressure checked & boxed with no more than 5 pounds variation per box. From design to manufacturing to load matching spring sets, every effort is made to provide the very best valve springs.

    Click Here for Spring Pressure Data Chart or Spring Dimensional Data Chart

    K-900 - K-Motion Premium Valve Springs is rated 1.0 out of 5 by 1.
    Rated 1 out of 5 by from not happy I have ran theses springs for 15 years on my engine an had very good luck with them but this set I just bought have had 3 to break in less then 40 runs . these are the same spring an same head an cam tht I have always ran an had never broke a spring before even with 250 runs on a set they never broke . I broke these in just like I always do I warm the engine up to temp an let it cool off . I do this 3 times an never had any problems till now I think the springs were bad from day one
    Date published: 2014-11-01
    • y_2017, m_11, d_17, h_2
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_1
    • loc_en_US, sid_10001_10001_37490, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
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