The Alvis 4.3-Litre was a series of luxury tourers that were introduced for the 1937 model year. The 4.3-Litre was largely similar to the Alvis Speed 25, with the notable exceptions of the larger engine and longer wheelbase. Alvis built the 4.3-Litre as a rolling chassis, with body styles such as drophead coupe, and sports tourer being provided by coachbuilders which included Vanden Plas and Charlesworth. As its name implies, the 4.3-Litre was powered by a 4.3L inline six engine that generated 137hp, which it sent to the rear wheels via a 4 speed manual transmission. Production of the Alvis 4.3-Litre ended in 1940, with a total of 198 examples built.