Fluidampr recommends to pin the damper to the crankshaft on GM/Chevy LS engines. Kit includes press fit steel dowel pin, drill bit, drill fixture, holding bolt for accurate alignment.Harmonic Balancer Drill Pin Kit GM/Chevy LS Drill Bit, Drill Fixture, Dowel Pin, and Holding BoltRecommended for GM/Chevy LS enginesSecure mounting.