Chevrolet Performance Harmonic Balancers are connected to the crankshaft of an engine to reduce torsional vibration and serve as a pulley for the belt drive system. Having a proper, reliable balancer is key to keeping your engine running smoothly as well as adjusting engine timing clearly and accurately. These Chevrolet Performance harmonic balancers are offered for all your performance needs and backed by quality with the Chevy name. Available for popular small block and LS-series engines.