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This 100 mm diameter idler pulley can be used to correct belt length when changing supercharger pulleys or harmonic balancer sizes on the C7 Z06 LT4, C6 ZR1 LS9, Cadillac CTS V gen 2 LSA and gen 3 LT4 or Camaro ZL1 gen 5 LSA and gen 6 LT4 supercharged engine. This idler can also be used for many other supercharged engine applications.