Adoption of an all-aluminum 6.23-liter V8 engine replacing the straight six of the Silver Cloud I was the most remarkable innovation when Rolls-Royce introduced the Silver Cloud II in 1959. This engine was still being utilized in Rolls-Royce motorcars some 40 years later. Rolls believing that evolutionary design improvement, rather than innovation, was the key to success. Of the 2,418 Silver Cloud IIs which were produced from 1959 to 1962, 107 were fitted with H.J. Mulliner drophead coupe bodies, as this example displays. The Silver Cloud II was enormously successful in the United States, and the slogan coined by David Ogilvy's advertising agency, 'At 60 mph, the loudest noise in the new Rolls-Royce is the ticking of the electric clock,' became a classic of its own.