Item #70413 CAT-3406A.  The Caterpillar 3406A engine was a popular choice for Class 8 heavy-duty trucks from various manufacturers, including Peterbilt, Kenworth, Freightliner, and Mack.   The 3406A was widely used due to its reputation for durability and reliability in demanding applications like long-haul transport and heavy hauling. Before ordering please check out SCALING on our "Product Information" page.