Shop used and remanufactured Mack E7 Mechanical Engines on MyLittleSalesman.com . Compare active listings with prices from $10,500 to $27,350. Sellers include Optimum Truck Parts, JJ Rebuilders, and Boots and Hank's Truck Parts. Filter by condition, price, or year to find the Mack E7 Mechanical Engine that fits your job.