The ’89 Ford F-350-sourced International 7.3L diesel engine sits on a Ford F-350 engine crossmember that has been welded to the M715’s frame. The engine is said to put out an estimated 290hp and 500 lb-ft of torque, which is a vast improvement over the engine’s stock 180hp and 345 lb-ft of torque. This engine was not originally equipped with a turbo, so Mackie added a Banks Power Sidewinder turbo, Banks up-pipe, and a custom downpipe. Exhaust is routed through a custom muffler-less exhaust system. Mackie made the glow-plug wiring harness and the engine wiring harness. The engine is cooled by a custom aluminum radiator that’s equipped with a pair of 12-inch fans. Electrical needs are met via a pair of Delco batteries that are mounted inside the vehicle, behind the seats. Also visible underhood is the remote-mount oil filter and the Dodge master cylinder for braking.