Product Description
Michigan Motorsports .660" LS Dual Valve Spring Kit with Titanium Retainers
PAC Racing Dual Springs | 1.810" Install Height | 160 lb Closed / 415 lb Open | .660" Max Lift | LS 4.8L 5.3L 5.7L 6.0L 6.2L
Build a more capable LS valvetrain with the Michigan Motorsports .660" Dual Valve Spring Kit. Designed for compatible LS-based 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L engine combinations, this kit pairs American-made PAC Racing polished dual valve springs with lightweight titanium retainers, integrated seat/seal assemblies, and valve keeper locks. It is an excellent choice for performance LS builds running an aggressive hydraulic roller camshaft profile requiring dependable spring pressure, controlled valvetrain motion, and clearance for up to .660" valve lift.
Key Features & Benefits
- PAC Racing Dual Valve Springs for Up to .660" Lift: This Michigan Motorsports kit includes American-made PAC Racing polished dual valve springs rated for camshaft combinations with up to .660" maximum valve lift. The dual-spring design is well suited for performance LS builds that need increased spring control beyond a basic stock-style valvetrain configuration.
- 160 lb Closed and 415 lb Open Spring Pressure: Rated at 160 lb of closed pressure at a 1.810" installed height and 415 lb open pressure at .660" lift, these springs provide the specified load range for compatible aggressive camshaft applications. This makes the kit a strong option for naturally aspirated, boosted, street-performance, and serious LS engine builds when the camshaft manufacturer’s requirements align.
- Lightweight Titanium Retainers: Lightweight titanium retainers are included to reduce valvetrain mass compared with heavier conventional retainer options. This provides a premium component for properly matched high-performance cylinder head combinations while supporting a more responsive valvetrain package.
- Integrated Seat and Valve Seal Assemblies: The integrated seat/seal assemblies combine the spring seat and valve seal support into one matched component. This simplifies installation on compatible applications and provides a cleaner conversion package than sourcing separate spring seats and seal-related components.
- Complete Michigan Motorsports Valvetrain Upgrade Package: Michigan Motorsports includes the critical springs, retainers, seat/seal assemblies, and keeper locks needed to support the specified valve spring configuration. It is an ideal package for camshaft upgrades, cylinder head refreshes, engine rebuilds, and LS performance combinations requiring a matched .660" lift-capable spring setup.
Kit Includes
- American-made PAC Racing polished dual valve springs rated for up to .660" lift
- Lightweight titanium retainers
- Integrated seat/seal assemblies
- Valve keeper locks
Specs
- Brand: Michigan Motorsports
- Product Type: LS dual valve spring kit
- Spring Manufacturer: PAC Racing
- Spring Design: Polished dual valve springs
- 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"
- Retainer Material: Titanium
- Seat/Seal Design: Integrated seat/seal assemblies
Notes
- Valvetrain Verification Required: Confirm installed height, actual valve lift, spring pressure requirements, coil bind clearance, and retainer-to-seal clearance before purchase. Camshaft lift alone does not confirm complete valve spring compatibility.
- Application Exclusions: Will not fit LS7, LS9, any Gen 5 LT1/LT4 engines, or most aftermarket cylinder heads with bronze guides. Verify cylinder head and valve guide configuration before ordering.
Key Fitments
- 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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Product Reviews
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Valve springs.
After breaking the same btr 660 springs the Michigan Motorsports 660 springs are far superior to any other spring. Great quality and craftsmanship
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.660 dual springs
They came in quick and are quality products definitely going to be using michigan motorsports for performance parts.
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Michigan motorsports valve spring kit
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.
