Proflow’s 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 rocker arm trunnions, bearings, and 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.