The Chevrolet And GMC 1983 Through 1990 Harmonic Balancer Assembly is an ideal replacement for your vehicle. With a durable construction featuring a rubber vibration damper bonded between ductile steel components, this harmonic balancer ensures optimal performance. It has undergone dimensional verification, material validation, and functional testing to guarantee quality. This harmonic balancer is designed to fit most Chevrolet and GMC models from 1983 to 1990 with V8 365CID 6.0L and V8366CID 6.0L engines. With its black finish, regular grade, serpentine drive belt type, and degree markings, it is a reliable and practical choice. Direct OE replacement numbers are General Motors: 10106421 and 10114166.