Product Description
Michigan Motorsports LS Harmonic Balancer Crankshaft Damper Bolt
- GM requires a new balancer bolt each time the engine is disassembled and the balancer is reinstalled.
- Made in the USA, this bolt is a direct replacement for the GM #12557840 bolt.
- Will fit all GM Gen 3, 4, & 5 series engines (except LS7/LS9/LT4/LT5 and Grand Sport LS3 Corvette)
