Innovators West supercharger pulley measurements are the diameter of the pulley when measured on the top of the ribs where the belt rides. Edelbrock uses a different measurement for their supercharger pulleys. Innovators West pulleys will measure approximately .078″ larger than a comparable Edelbrock supercharger pulley.
8-Rib Edelbrock E-Force Blower Pulley #912 Series
Get more Boost with Edelbrock E-Force 8-Rib Blower Pulleys. Available in 2.75″, 3.00″, 3.25″, 3.50″ and 3.75″ all for the same low price!