When the Alvis range was realigned in 1936, the 3½-litre became the 4.3-litre, while the Speed 20 became the Speed 25. With the opposition closing in on the Speed 20, Alvis took the 3½-litre’s engine and married it to the Speed 20’s chassis. Chassis-wise, the Speed 25 received new springs and dampers in an attempt to help control the new, substantially more powerful version. The body-frame was redesigned by Cross and Ellis, and the result was a sleek and highly desirable Alvis that found favour with a wide range of enthusiastic new buyers.
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Information from Octane Magazine.