104 bhp, 44.8 cu. in. OHV inline eight-cylinder engine, hree-speed synchromesh sliding gear manual transmission, emi-elliptical leaf-spring front and rear suspension with a semi-floating rear axle, nd four-wheel mechanical brakes. Wheelbase: 132 in.One of only 843 built; an exceptionally rare example of “Buick’s Cadillac”Equipped with numerous desirable options and accessoriesThrough the first three decades of the 20th century, uick championed the inherently superior and better-performing overhead-valve engine in popularly priced automobiles. In 1931, he company made an important engineering shift from their long-lived six-cylinder engine, s the engineers had grown to feel that the design had reached its limits in size, moothness, nd efficiency. In its place, uick employed an all-new straight eight-cylinder engine design to power its cars, he cache of which—an entire line of eight-cylinder models!—was thought to be good for sales and the marketplace.Leading the all-eight-cylinder Buick line for 1931 was the Series 90, ith a 104-horsepower engine that incorporated such innovations as an oil temperature regulator to cool the engine at high speeds and warm it in cold weather, s well as thermostatically controlled radiator shutters, s found on Duesenbergs and Packards. According to historian Beverly Rae Kimes, very component of the new model was tested over hundreds of thousands of miles to ensure that it would be as durable as previous Buicks. The basic resemblance of the Series 90 to a Cadillac was no coincidence; the two shared many of the same Fisher bodies, nd the introduction of the 1931 Series 90 marked the beginning of a decade-long Cadillac-Buick rivalry for high-end luxury sales.Not surprisingly, he Series 90 is today one of the few Buicks accorded Full Classic status by the Classic Car Club of America.The 1931 Series 90 Sport Roadster presented here, ne of the rare survivors of only 843 built, isplays a quality older restoration that meets the most discriminating standards. Having been a Southern car, t was reportedly in outstanding and rust-free condition.Very well equipped, he Sport Roadster is outfitted with dual driving lights and cowl lights, rosted wind wings, ual side-mounted spares with covers and mirrors, nd the accessory side curtains, hich can be installed should it be caught in the rain.