The Allison V-1710 aircraft engine designed and produced by the Allison Engine Company was the most common US-developed V-12 liquid-cooled engine in service during World War II. Versions equipped with turbo-superchargers gave excellent performance at high altitude in the twin-engined Lockheed P-38 Lightning, and turbo-superchargers were also fitted to experimental single-engined fighters with similar results.
The United States Army Air Corps (USAAC) preference for turbo-superchargers early in the V-1710's development program meant that less effort was spent on developing suitable mechanically driven centrifugal superchargers for the Allison V-12 design, as other V-12 designs from friendly nations like the British Rolls-Royce Merlin were already using.