Product Description
Michigan Motorsports LS Rocker Arms with Professionally Installed Trunnion Roller Bearings
Set of 8 Rocker Arms with 8620 Steel Trunnions and Caged Roller Bearings
Upgrade the valvetrain in a compatible stock or modified LS engine with this set of eight professionally assembled LS rocker arms. Each rocker arm has been disassembled and fitted with an LS1-style retrofit trunnion kit featuring a premium 8620 steel-alloy trunnion and caged roller bearings. This upgraded design replaces the factory powdered-metal trunnion and loose, cageless needle bearings, reducing the possibility of loose bearing needles entering the engine if a factory-style bearing fails. The rocker arms arrive with the upgraded trunnions and bearings already installed.
Key Features & Benefits
- Professionally Installed Trunnion Kits: Each LS rocker arm has been disassembled and professionally fitted with a new retrofit trunnion and bearing assembly. The upgraded components arrive installed, eliminating the need to press the original bearings out and assemble the conversion separately.
- Premium 8620 Steel-Alloy Trunnions: The original powdered-metal trunnions are replaced with upgraded 8620 steel-alloy components. This provides a more durable trunnion configuration for compatible factory, modified, heads-and-cam and forced-induction LS engine combinations.
- Caged Roller Bearing Design: Replaces the factory-style loose, cageless needle bearings with caged roller bearings. The caged design helps contain the bearing elements and reduces the possibility of loose needles spreading throughout the engine following a bearing failure.
- Eight-Rocker Set: Includes eight LS Series rocker arms and eight LS-type retrofit trunnion assemblies already installed. The supplied quantity is clearly defined for customers purchasing rocker arms by an eight-piece set.
- Stock and Modified LS Compatibility: Suitable for the listed stock and performance LS engine applications, including aggressive cylinder-head and camshaft combinations. Fitment includes select 4.8L, 5.3L, 5.7L and 6.0L LS-based engines.
Installation Notes
- Rotate each trunnion so the flat recessed side of its center hole faces upward. The socket-head cap screw must seat against this recessed flat surface.
- Install the rocker arms using the supplied socket-head cap screws and tighten them to 22 ft-lbs following the OE installation procedure.
Key Fitments
- LS1 / LS2 / LS6 / LR4
- Vortec 5300 LM7 L59 LM4 L33
- 4.8L / 5.3L / 5.7L / 6.0L Engines
