In 1978 the Princess Two was launched and the biggest change was the announcement of the two new engines, a 1.7 and 2.0 litre. Both were four cylinder units from the |New O-Series family, which in essence was an OHC development of the venerable B-Series. With the engine change came a range of styling tweaks, which made the car more efficent to build, byt somewhat reduced its showroom appeal.