Supercharger Upgrades

These lower pulleys are compatible with ATI part numbers 918854 and 918856 for the LSA and LT4 (Camaro/CTS-V only) damper. They are machined from 6061 aluminum and anodized for protection. The pulleys are available in three sizes: 230mm (9.06") [LSA 16%/LT4 13%] 240mm (9.45") [LSA 21%/LT4 18%] IDLER RELO BRACKET REQUIRED FOR LSA 250mm (9.84") [LSA 26%/LT4 23%] IDLER RELO BRACKET REQUIRED FOR LSA Note the 9.84 can interfere with the sway bar on extreme suspension geometry events in LT4 ZL1s/CTS-Vs.

This bracket is meant to relocate the lower idler on LSA engines to allow for a larger diameter crank pulley on the blower drive. This bracket is intended to be used with factory bolts and factory idlers, but aftermarket idlers are also able to be used. It is not recommended to use a 50mm idler pulley on the bottom though due to the likelihood of failure from exceeding the rpm limit of the bearings.