3 0 Mack AC 427 Engine Core Contact for price (Core) Mack AC-427, ENGINE ASSEMBLY- Family Number: 4MKXH11.9H73, Horsepower: 427, Displacement: 11.9L, Part Number: 4M42780, For more information about this item, give us a call. We ship... ConditionUsedHorse Power427 HPPart Number4M42780Stock NumberP-99398 MLS Number13489470CategoryEngine Cores Last Updated4/1/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info