Engines | Mounts, , (USED) 2004 Mack AI-400 Diesel Engine (NON EGR), Serial # 350553, 400HP @ 1950, LOW MILES! Test Run 2-6-17. Visit jjrebuilders.com for more information on this and any other Diesel Engine you may be looking for. Call 1-800-971-3019. INV # 003188