The Rover P5 started life as a volume production model to sell beneath the P4 and ended up a low production model selling above. Innovative engineering including advanced V6 engines, front or four wheel drive, were left in the research department and a cost conscious traditional construction went on sale. David Bache designed the final P5, as well as some of the rejected designs. Bache also designed the Coupe, introduced with the MkII in 1962, which might have been a pillarless design but for production problems. The P5 was launched in 1958 whilst sales of the P4 were in full swing. The heavy P5 was quickly given a brand new 2995cc created out of the existing 6-cylinder engine, and this engine was given a new Weslake head from 1962 the same year that the Coupe was launched. In 1967 the Rover P5B appeared in both saloon and coupe variants carrying the 3528cc V8 engine acquired from Buick. Production ended in 1973.