Product Description
Genuine GM LS3 Intake Rocker Arm Conversion Kit with Billet Stands
Intake Rocker Conversion Kit for Rectangle Port LS3 Cylinder Head Swaps
This LS3 Intake Rocker Arm Conversion Kit with Billet Stands is designed for builders converting from cathedral port LS cylinder heads to rectangle port LS3-style heads such as castings 821, 823, and 5364. Rectangle port heads require offset intake rocker arms and dedicated stands to maintain proper valvetrain geometry. This kit provides the correct Genuine GM LS3 intake rocker arms along with upgraded Michigan Motorsports billet rocker stands, allowing you to reuse your existing LS1-style exhaust rocker arms while ensuring proper fitment, strength, and long-term reliability.
Key Features & Benefits
- Correct LS3 Intake Geometry: Includes offset LS3-style intake rocker arms and dedicated stands required for proper geometry on rectangle port cylinder heads.
- Ideal for Cathedral-to-Rectangle Port Conversions: Designed specifically for engines upgrading from cathedral port heads to LS3 821/823/5364 rectangle port castings.
- Upgraded Billet Rocker Stands: Michigan Motorsports billet stands are CNC machined from 6061 aluminum to reduce flex and provide consistent rocker saddle height compared to OEM stands.
- Improved Valvetrain Stability: Billet stands offer tighter tolerances for more consistent lifter preload and improved durability in stock or performance builds.
- OEM Quality Components: Genuine GM LS3 intake rocker arms ensure factory-level fit, strength, and long service life.
Kit Includes
- QTY 8 – Genuine GM LS3 Intake Rocker Arms
- QTY 2 – Michigan Motorsports Billet Rocker Arm Stands (Replaces GM #12600936)
Important Notes
- Exhaust Rocker Arms Not Included: Reuse your existing LS1-style/cathedral port exhaust rocker arms.
- Designed for Rectangle Port Heads: Fits LS3-style heads including castings 821, 823, and 5364.
