Originally, the Series 60 had the 5.4-litre OHV Buick Straight-6 engine from the Series 70. It had, at the beginning of the generation, a full-length running board denoting the top model for Buick at the time, shared with the short wheelbase, entry level Series 40. The body styles available were torpedo, sedan, coupe and roadster convertible, using GM's 'B-body' platform. This means there were various model names based on the different body styles - the '60' denoted the series and the second digit indicated the body style. For example, a 67 relates to a flat-back sedan. Starting with this generation, all GM cars shared a corporate appearance and modest yearly changes were introduced to freshen the appearance. In 1931, the running board was reduced and the OHV 3.6-litre Buick Straight-8 engine was introduced. The Series 60 remained almost the same looks-wise in 1931 and 1932 and a total of 55 135 cars was produced in those two years.