These COMP Cams GM LS Series retrofit trunnion kits are designed to convert stock LS Series rocker arms into captured roller trunnions for high-rpm race applications. They include the rocker arm trunnions, rocker arm bearings, and rocker arm retaining rings for a complete installation. Keep your valvetrain reliable throughout the entire rpm range with one of these GM LS rocker arm bearing upgrade kits. Kits include: 16 rocker arm trunnions, LS-type retrofit, 32 rocker arm bearings, LS-type retrofit, 32 rocker arm retaining rings, LS-type retrofit, 16 bolts for LS trunnion kit, 2 washers for pressing trunnions. Installs in about an hour.