2013 PACCAR MX13, Truck Tractor, Engine Assys, Fits to: Peterbilt 384, (Used) 2012 PACCAR MX13 ENGINE ASSEMBLY- Family Number: CPCRH12.9M01, Displacement: 12.9L, Horsepower: 431, Serial Number: Y016900, E.C.S.: DDI, TC, ECM, EGR-C, OC, SCR-U, PTOX, 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 431, Serial# Y016900, Casting# Y016900 1XPVDP9X0DD204958