Comp Cams 1981-16 Max-Lift BSR Shaft Rocker Arm System for GM LS LS1 4.8L 5.3L 5.7L 6.0LCOMP Cams introduces another industry first with their Max Lift BSR Shaft Rocker Systems, a bolt in bushed shaft rocker system for GM LS applications that increases system stiffness and allows LS platforms to achieve higher levels of performance. By tying all eight rocker arms together on a single shaft that fits in the stock rocker stand, COMP Cams has found a way to improve valve train dynamics, increase valve train stiffness and reduce deflection.