2015 Cummins ISX12-G, Truck Tractor, Engine Assys, Fits to: Mack CXU633T, (Used) 2014 Cummins ISX12-G, ENGINE ASSEMBLY- Family Number: ECEXH0729XBA, Displacement: 11.9L, Horsepower: 400, Ar.No./CPL: 3647, Serial Number: 75027362, Part Number: 22229550, ECS: HO2S, PCM, TWC, Fuel: CNG, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Horse Power 400, Serial# 75027362, Casting# 75027362 1M1AW27Y0FM010264