2006 Mack AC380, Truck Tractor, Engine Assys, Fits to: Mack CXN612, (Used) 2005 Mack AC-380/410, ENGINE ASSEMBLY- Family Number: 5MKXH11.9H70, Displacement: 11.9L, Horsepower: 380, Serial Number: 5W3194, E.C.S: EM, EC, TC, CAC, DI, SPL, CEGR, 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 380, Serial# 5W3194, Casting# 5W3194 1M1AK02Y36N004038