Designed to relocate the idler pulley on the 4.8, 5.3, 5.7, 6.0, and 6.2 Chevrolet 1999-2011 LS Gen III/IV truck engine. This part is required when installing a LS1, LS2, or any other performance LS car intake manifold on the truck engine. Moves the idler pulley down out of the way to clear the lower mounted throttle body. Water pump spacers and a 1998-02 Camaro water pump are also required to install the LS car or any other performance intake manifold on your truck engine. CNC machined from 6061 T6 billet aluminum. Includes grade 8 zinc coated allen bolts and stainless washers. Requires a different length serpentine belt.