BDS Steel Blower Crank Hub (BDSCH-5004)

BDS crank hubs are made from 4100 series aircraft alloy hardened steel, designed to replace the stock factory harmonic balancer for blower application only, and are necessary for proper operation and longevity of the complete blower drive assembly. Factory harmonic balancers are not designed to handle the additional stress of driving a supercharger along with other accessories. They will normally crack or break near the keyway and come off the engine causing severe damage