Harmonic Balancer - Serpentine Super Damper - 6.780 in OD - SFI 18.1 - AC Pulley - Aluminum / Steel - Black - Internal Balance - GM LS-Series - Each Brand- ATI PERFORMANCE MPN 917278 . **NOTE: Y-Body 6-groove w/A/C pulley, 10% underdrive. Truck Freight- NO State Restrictions Canada Restrictions- NO
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