Packard Merlin

As the Merlin was considered to be so important to the war effort, negotiations were soon started to establish an alternative production line outside the UK. Rolls-Royce staff visited a number of North American automobile manufacturers in order to select one to build the Merlin in the U.S. or Canada. Henry Ford rescinded an initial offer to build the engine in the U.S. in July 1940, and the Packard Motor Car Company was subsequently selected to take on the $130,000,000 Merlin order. Agreement was reached in September 1940, and the first Packard-built engine, designated V-1650-1, ran in August 1941.

By the end of its production run in 1950, almost 150,000 Merlin engines had been built; over 112,000 in Britain and more than 37,000 under license in the U.S.

Source - http://en.wikipedia.org/wiki/Rolls-Royce_Merlin#Packard_V-1650

Samples of the Packard-built Merlin

North American P-51