an upgraded cambridge model, now called the a60, was introduced in october 1961. it included a new 1.6-litre version of the b-series straight-four engine which had first been used in the mga. power is at 4500 rpm. modified styling included side chrome stripes – some models with contrasting colour infills – and reduced fins on the rear wings. the style continued to be known as "farina". this body covered a chassis that was slightly longer in wheelbase and wider in track than the a55. this allowed three people to be accommodated on the rear seat. anti-roll bars were added to both front and rear suspension. an estate version with the petrol engine, called the countryman, was also offered.the a60 from 1966 was offered with many optional extras to keep up with increasing competition from the continent and japan.