Ati Performance Harmonic Balancer - Serpentine Super Damper - 6.780 in OD - SFI 18.1 - AC Pulley - Aluminum / Steel - Black - Internal Balance - GM LS-Series - Each-918629--Notes: 10% underdriven w/OEM Size A/C Pulley State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO