Roller Trunnion Rocker Arm Upgrade Kit

The Michigan Motorsports LS1 Rocker Arms are a performance upgrade for your LS-based engine's valvetrain. Each rocker arm comes with a true roller bearing trunnion upgrade professionally installed, eliminating the need for press work and making them ready to bolt on. This upgrade replaces the failure-prone factory needle bearings with more durable caged roller bearings, significantly reducing the risk of bearing failure and preventing debris-related damage to your engine. These are ideal for aggressive camshaft and cylinder head combinations, whether your engine is stock or part of a high-output build. Key benefits include enhanced reliability through the use of caged roller bearings, offering superior durability compared to stock LS1 needle bearings. Their performance-ready design makes them an excellent choice for enthusiasts looking to push their engine's capabilities with upgraded camshafts and cylinder heads. This kit includes 16 LS Series rocker arms with the roller bearing trunnion upgrade pre-installed. Please note that bolts are not included; reuse your stock bolts or purchase them separately. The rocker arms fit all 4.8L, 5.3L, and 5.7L LS-based engines, as well as cathedral-port 6.0L (LQ4/LQ9) applications. They will NOT fit 6.2L engines or 2007-later 6.0L engines (such as L96, L92, LY6, LS3, L99, L76, L77).