Product Description
Genuine GM LS3 Rocker Arms with Michigan Motorsports Billet Stands
Complete OEM Rocker Arm & Billet Stand Upgrade for Rectangle Port LS Engines
This Genuine GM LS3 Rocker Arm Kit with Michigan Motorsports Billet Stands is an ideal solution for replacing worn or missing rocker arms on rectangle port LS engines, as well as for stock rebuilds and mild performance applications. The intake rocker arms feature the correct offset fulcrum required for LS3-style rectangle port cylinder heads, while the matching exhaust rocker arms complete the valvetrain assembly. Paired with Michigan Motorsports billet rocker stands, this kit delivers improved rigidity, reduced flex, and more consistent rocker geometry compared to factory cast stands.
Key Features & Benefits
- Correct LS3 Intake Offset Geometry: Genuine GM intake rocker arms feature the proper offset fulcrum required for rectangle port LS3-style cylinder heads.
- Complete OEM Rocker Replacement: Includes both intake and exhaust rocker arms for a full factory-style valvetrain refresh.
- Billet Rocker Stand Upgrade: Michigan Motorsports billet stands are CNC machined from 6061 aluminum to reduce flex and maintain consistent rocker saddle heights.
- Improved Valvetrain Stability: Tighter tolerances compared to OEM stands help maintain consistent lifter preload, especially important in higher-mileage engines.
- OEM Reliability with Added Strength: Combines Genuine GM rocker arms with upgraded billet stands for long-term durability in stock and mild performance builds.
Kit Includes
- QTY 8 – GM LS Intake Offset Rocker Arms (GM #12696105)
- QTY 8 – GM LS Exhaust Rocker Arms (GM #12681275)
- QTY 2 – Michigan Motorsports Billet Rocker Arm Stands (Replaces GM #12600936)
Key Fitments
- Rectangle Port LS Cylinder Heads
- LS3
- L99
- L76
- L92
- L96
- LY6
- L77
- LS9
- LSA
