Not sure what we pulled this off from, more than likely a Vortech or Powerdyne. This is an 8-rib (7 raised grooves, 8 recessed).
2.70" 7 rib Supercharger PULLEY for VORTECH 20mm bore, POWERDYNE, SCORPION VW
2.40" 6 rib belt Supercharger PULLEY for VORTECH 20mm bore POWERDYNE SCORPION VW
3.12" 6 rib Supercharger PULLEY for POWERDYNE, SCORPION, 20mm bore
3.10" 6 rib Supercharger PULLEY for VORTECH, POWERDYNE, SCORPION 20mm bore
2.90" 6 rib Supercharger PULLEY for VORTECH, POWERDYNE, SCORPION 20mm bore
3.10" 6 rib Supercharger PULLEY for VORTECH 20mm bore, POWERDYNE, SCORPION VW