2 1/4" hole.
Blower Pulley 8 mm 50 tooth 1 1/2 Water Pump NHRA IHRA IMCA Mud truck
Blower Pulley 8 mm 55 tooth 3 1/2 GMC 671 871 SBC BBC NHRA IHRA IMCA Mud truck
Blower Pulley 14 mm 25 tooth 3 1/2 GMC 671 871 SBC BBC NHRA IHRA IMCA Mud truck
Blower Pulley 14 mm 43 tooth 3 1/2 GMC 671 871 SBC BBC NHRA IHRA IMCA Mud truck
Blower Pulley Belt 8 mm 3" wide Gates 1432 GMC 671 871 BBC NHRA IHRA Mud truck
Blower Pulley Belt 14 mm 4 1/8" wide Gates 14MGT-1566-104 GMC 671 871 NHRA Mud
