The Guiberson Diesel Engine Company was a subsidiary of the Guiberson Corporation of Dallas, Texas which manufactured oil-industry equipment. Work on its first aircraft engine, the A-980, began in 1930. It was test flown in a Waco biplane and certificated in late-1931. The U.S. Navy showed interest in the slightly larger A-918 engine for its low specific fuel consumption; however, diesels developed by the Navy proved too heavy for their power rating and weren't useful as combat engines.
The later A-1020 was similar to its predecessors, but included improved valves. It was test-flown in a Stinson Reliant S.R. 9 aircraft and certificated in 1940 at 231 kW (310 shp). The T-1020 diesel was manufactured during World War II for use in light tanks, and was equipped with a gear-driven fan for cooling. Aircraft use of this engine, cooled by the propeller slipstream, was hampered by the emphasis on tank engine production during the war.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.