1985 Mack EMC6, Truck Tractor, Engine Assys, Fits to: Mack RS686LST, (Used) 1984 Mack EMC6, ENGINE ASSEMBLY- Displacement: 11.0L, Horsepower: 300, Serial Number: 5K2828, ECS: ASPL, 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 300, Serial# 5K2828, Casting# 5K2828 1M2T153Y4FM002646