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This 76mm 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.