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  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3
  • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3

    • Michigan Motorsports .660" Dual Valve Spring Kit Titanium Retainers 4.8 5.3 5.7 6.0 6.2 LS1 LS2 LS3

    Michigan Motorsports

    $309.99
    (3 reviews) Write a Review
    SKU:
    MM-T.660SpringKIT
    UPC:
    810144060194
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    Product Description

    Michigan Motorsports .660" Dual Valve Spring Kit w/ Titanium Retainers

    For LS-Based Engines – 4.8L, 5.3L, 5.7L, 6.0L, 6.2L – LS1, LS2, LS3, LQ4, LM7

    Maximize your LS engine’s performance and reliability with the Michigan Motorsports .660" Dual Valve Spring Kit. Featuring premium American-made PAC Racing polished dual springs, lightweight titanium retainers, integrated seat/seal assemblies, and valve keeper locks, this kit is designed to handle aggressive camshaft profiles with up to .660" lift. The integrated seat/seal design simplifies installation and improves durability compared to conventional setups, making it an excellent choice for high-performance LS builds.

    Kit Includes

    • American-made PAC Racing polished dual valve springs rated for up to .660" lift
    • Lightweight titanium retainers for reduced valvetrain mass
    • Integrated seat/seal assemblies for easier installation
    • Valve keeper locks

    Specifications

    • Install height: 1.810"
    • Closed spring pressure: 160 lb @ 1.810" installed height
    • Open spring pressure: 415 lb @ .660" lift
    • Maximum spring lift: .660"
    • Coil bind height: 1.015"

    Fitment

    • LS-based engines: 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
    • Common applications: LS1, LS2, LS3, LQ4, LM7
    • Will not fit: LS7, LS9, any Gen 5 LT1/LT4 engines, and most aftermarket cylinder heads with bronze guides

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    • 5
      Valve springs.

      Posted by Josef Ridenour on Feb 6th 2025

      After breaking the same btr 660 springs the Michigan Motorsports 660 springs are far superior to any other spring. Great quality and craftsmanship

    • 5
      .660 dual springs

      Posted by Alan on Aug 31st 2023

      They came in quick and are quality products definitely going to be using michigan motorsports for performance parts.

    • 5
      Michigan motorsports valve spring kit

      Posted by James on Oct 10th 2022

      I bought this kit so i could do a maintenance valve spring swap on my current cam setup because I have a little over 30k miles on my cam and valve train component's. The quality of the kit was great and my valve train sounds nice and quite. I ordered the kit late Thursday night and it was shipped out Friday morning and arrived on monday afternoon. Overall great product and Michigan Motorsports ships fast.