Chrysler 5.9 Marine Engines ATK premium quality marine engines are designed built specifically for boating. No matter how you use your boat, ATK Marine engines will provide maximum performance long-term durability. There are over 150 processes involved in the remanufactuing each ATK engine that are desinged to meet or exceed O.E. specifications. Featured procedures include Engine blocks are magnafluxed, cylinders bored and precision-honed, and main saddles line-honed to exacting O.E. specifica