A harmonic balancer is a device used to reduce vibrations in an engine. It helps to maintain smooth rotation and prevent damage to the engine by balancing out the uneven forces created by the engine's movement. Full definition
This 76 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. (weaponxmotorsports.com)
These are a high - quality harmonic balancer bolts from GM Performance Parts. (weaponxmotorsports.com)
NOTE: Use on LS327 iron block engine requires harmonic balancer P / N 12601402. (chevrolet.com)