Product Description
Michigan Motorsports .660" Dual Valve Spring Kit with Steel Retainers for LS Engines
Drop-In Spring Upgrade for Most Factory LS Cylinder Heads – Supports Aftermarket Camshafts up to .660" Lift
Upgrade your LS valvetrain with the Michigan Motorsports .660" dual valve spring kit with steel retainers. Designed for most factory LS cylinder heads, this kit pairs polished dual springs with high-strength steel retainers to support aftermarket camshafts with up to .660" lift. The dual spring design provides increased seat and open pressure compared with factory single-spring setups, helping reduce valve float and maintain valve control at elevated RPM. Suitable for compatible 4.8L, 5.3L, 5.7L, 6.0L and 6.2L LS street, strip and track builds, the kit includes spring locators for stock guides, valve locks and seals. LS7 heads require a .030" shim, and this kit will not work on LS9 heads.
Valve Spring Specifications
- Lift Capability: .660"
- Spring Diameter: 1.300"
- Seat Pressure: 155 lbs @ 1.780"
- Open Pressure: 380 lbs @ 1.180"
- Maximum Load: 400 lbs @ 1.130"
- Coil Bind Height: 1.070"
Key Features & Benefits
- Supports up to .660" Valve Lift: Designed to accommodate aftermarket camshaft profiles in compatible LS engines. The increased lift capability makes this Michigan Motorsports spring kit an option for performance camshaft installations in street, strip and track applications.
- Dual Spring Valve Control: Polished dual valve springs provide increased seat and open pressure compared with factory single-spring configurations. This helps reduce valve float and maintain consistent valve control as engine speed and camshaft lift increase.
- High-Strength Steel Retainers: Includes steel retainers for durability in demanding performance applications. Paired with the dual springs, these retainers provide a durable component choice for compatible LS valvetrain upgrades.
- Drop-In Fit for Most Factory LS Heads: Designed around most factory LS cylinder heads and supplied with locators for stock valve guides. This configuration simplifies spring selection for the listed applications, with the LS7 shim requirement and LS9 exclusion noted below.
- Springs and Supporting Hardware Included: Combines polished dual springs, steel retainers, stock-guide locators, valve locks and seals in one kit. These included components support replacing the valve spring assemblies during a compatible camshaft upgrade or cylinder head service.
Kit Includes
- Polished dual valve springs
- Steel retainers
- Spring locators for stock valve guides
- Valve locks
- Valve seals
Notes
- LS7 cylinder heads require the use of a .030" shim.
- This kit will not work on LS9 heads.
Key Fitments
- Fits most factory LS cylinder heads
- 4.8L, 5.3L, 5.7L, 6.0L, 6.2L LS Engines
- LS1, LS2, LS3, LS4, LS6
- L76, L92, L99, LM7, LQ4, LQ9, L33, LSA
