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 917276 . **NOTE: Aluminum balancer for LS1, 6-groove serpentine, F-Body. 10% underdrive with AC pulley. Also fits 2005-06 GTO according to ATI. Truck Freight NO
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