1999 GM/Chev (HD) V8, 5.7L, Truck Delivery, Engine Assys, Fits to: GMC W3500, (Used) 1998 GM/Chev (HD) 5.7L, ENGINE ASSEMBLY- Part Number: 12562392, Serial Number: 57b1GXFC, Family Number: XGMXH05.7584, Displacement: 5.7L, Horsepower: 350, E.C.S.: SFI, EGR, TWC, H02S, 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 350, Serial# 57b1GXFC, Casting# 57b1GXFC 4KDB4B1R0XJ000246