Rebuilt double groove balancer fits 78-83 200ci motors. The balancers are first disassembled and cleaned, then inspected for defects, including stripped bolt holes and worn or cracked key-ways and hubs. The balancers are then prepared for assembly, where the timing marks are set to the factory specification by using a laser aligning process.  After the timing marks are set, the harmonic balancers are then injected with a high-temperature, high-strength silicone rubber that is then platinum cured for a extremely strong hold.  The new silicone rubber is capable of withstanding temperatures in excess of 450 degrees, and will hold up against pressures as high as 770 psi.  Our rebuilt harmonic balancers carry the manufacturers 3 year limited warranty.