Harmonic Balancer Installation Tool compatible with all GM LS & LT series engines 1997-current (Gen 3, 4, & 5), except 1992-1997 Gen 2 LT1 5.7 Engines. This Harmonic Balancer Installation Tool compatible with all GM LS & LT series engines 1997-current (Gen 3, 4, & 5), except 1992-1997 Gen 2 LT1 5.7 Engines.