Crankshaft Hubs

Designed specifically for circle track racers, this SB Chevy aluminum crank hub is NOT a harmonic damper. Hub is significantly lighter than a harmonic balancer and dramatically reduces rotating weight for quicker acceleration off the turn. Hub has engraved timing marks at 0° and from 30°-42°, is 4-3/8" in diameter, features (3) 3/8"-16 accessory threads and weighs just one pound. Fits all internally balanced small block Chevy engines. Designed for internally balanced engines only and must be balanced with rotating assembly. Supercharger Crank Hubs are made from 4100 series aircraft alloy hardened steel, designed to replace the stock factory harmonic balancers for blower applications only and are necessary for proper operation and longevity of the complete blower drive assembly.