In any case, Packard's version of the Merlin XX, which the Detroit automaker dubbed the V-1650-1, was ready to run by August 1941. It did feature a number of improvements over the British-built ...

The facility was repurposed to produce war material such as the Packard V-1650 Merlin that was used to power the North American P-51 Mustang fighter plane. Photo: National Automotive History ...

The Rolls-Royce Merlin engine played a pivotal point ... (the P-51 used a licensed copy of the Merlin built by Packard). ... The American version went by the much less imaginative V-1650 ...