The Department of Defense, through the Defense Logistics Agency (DLA) Land Warren, is seeking sources capable of manufacturing and providing diesel cylinder heads for military vehicles, specifically the High Mobility Multipurpose Wheeled Vehicle (HMMWV) and the M997A3 Ambulance. The procurement involves a minimum quantity of 333 and a maximum of 8,325 units under a five-year indefinite delivery indefinite quantity contract, with the National Stock Number (NSN) 2815-01-435-1707 and part number 12556822 from AM General LLC. Cylinder heads are critical components of diesel engines, sealing the top of the cylinders to facilitate the combustion process. Interested parties must submit their capabilities to Jon Machacek at jon.machacek@dla.mil, as qualification testing and evaluation are required to become an approved source, although approval does not guarantee future business opportunities.