Brian Tooley BTR Shaft Rocker Kit for 1997+ Chevrolet Gen III LS 4.8L 5.3L 5.7L 6.0L LS1 LS6 LS2 LS3 LQ4 LQ9Introducing the new BTR Shaft Rocker Kit The Next Step in the Evolution of LS Rocker Arm Trunnion Kits Performance minded engine builders know there is an inherent issue with valve train deflection when using stock rocker arm mounting in Chevrolet Gen III IV cylinder heads. The new BTR shaft rocker system significantly reduces that deflection thereby improving performance and durability. This kit features technology typically only found in high end