GM LS & LT Based COPO Camaro Crate Engine Serpentine Dampers 2012 - 2017 OEM Supplied ENGINE DAMPER PART # OUTER DIAMETER SHELL MATERIAL SHELL ASSEMBLY # GROOVES 4 RIB PULLEY # HUB # HUB MATERIAL '12-'15 Z BODY LS - N/A 350, 396, 427 918427 [1] 7.48" ALUMINUM 917073 6 ...