Michigan Motorsports Billet LS3 Rectangle Port Rocker Arm Stands (Pair) | Replaces GM 12600936 | Fits 6.0L 6.2L LS3 L99 L76 L77 L92 L96 L94 LY6 L9H LSA | CNC Machined for Strength & Stability

The Michigan Motorsports Billet LS3 Rectangle Port Rocker Arm Stands are precision CNC-machined from high-strength billet aluminum to replace the factory cast rocker stands found on LS3-based cylinder heads. Designed to handle the demands of high-lift camshafts, heavy valve springs, and boosted applications, these billet stands provide unmatched valvetrain stability and strength. By replacing GM part number 12600936, these stands eliminate flex under high-RPM operation and maintain proper rocker arm geometry, ensuring consistent valve lift and improved durability. Ideal for both street and competition LS builds, they are compatible with LS3, L99, L76, L77, L92, L96, L94, LY6, L9H, and LSA engines. Each pair is precision-milled in the USA and quality checked for perfect alignment, making them the ultimate upgrade for serious LS enthusiasts looking for long-term reliability and performance.

• CNC-Machined Billet Aluminum Construction – Milled from high-grade billet aluminum for superior rigidity and reduced flex under extreme RPM and spring pressure.
• Replaces OEM Stand 12600936 – Direct replacement for the factory cast rocker arm stands, offering improved strength and precision for LS3 rectangle port heads.
• Enhanced Valvetrain Stability – Maintains rocker geometry and alignment under aggressive cam profiles, heavy spring loads, or forced induction setups.
• Designed for LS3 Rectangle Port Engines – Compatible with LS3, L99, L76, L77, L92, L96, L94, LY6, L9H, and LSA 6.0L–6.2L engines found in Corvette, Camaro, G8, and GM trucks.
• Engineered by Michigan Motorsports – Built and tested by LS performance experts to deliver reliability, precision fitment, and long-term durability in high-performance applications.