The Buick Master Six is a car from Buick. Under the bonnet: 255 cuin Buick OHV I6.
Where it came from
The Buick Master Six (also Series 40 and Series 50 depending on wheelbase) was an automobile built by Buick from 1925 to 1928. Previously, the company manufactured the Buick Six that used the overhead valve six-cylinder 242 cu in (4.0 L) engine in their high-end cars, and the four-cylinder Buick Four for its smaller, less-expensive model.
After 1924, it dropped the four-cylinder engine and designed a small six, the Buick Standard Six, to replace the Buick Four. The name "Master Six" was introduced for high-end cars sharing the GM B platform with the Oldsmobile Model 30, and were powered by the 255 cu in (4.2 L) Buick inline-6 engine released the year before. The yearly changes were a result of a new business philosophy called planned obsolescence.
Under the skin
Power comes from 255 cuin Buick OHV I6; other versions carried different engines, listed in the specification table below. It shifts through a 3-speed synchromesh manual. The layout matters: a front engine drives the rear wheels, the classic proportion — long bonnet, cabin set back — that most people picture when they picture a sports saloon or a grand tourer. The wheelbase is 120 in / 128 in. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
In context
Its family tree is legible: it took over from the Buick Six; its successor was the Buick Series 60 / Buick Series 80 / Buick Series 90; assembly was at Flint, Michigan (Buick City), United States. Nearby in the Buick catalogue sit the Buick First Call and the Buick Funeral Car.