The anatomy had a wheelbase of 8 anxiety 8 inches (2.64 m), and was about a beneath adaptation of the one advised for the 2.5-litre saloon, a car produced in abundant greater numbers, and aboriginal been apparent in the SS 90 of 1935. Suspension was on half-elliptical springs all annular with adamant axles. The agent was a development of the old 2.5 litre Standard assemblage adapted from ancillary valve to aerial valve with a fresh butt arch advised by William Heynes and Harry Weslake. The ability achievement was added from 70 bhp (52 kW) to 100 bhp (70 kW). Twin SU carburettors were anchored anon to the butt head. In 1938 the agent was added continued to 3.5 litres and the ability added to 125 bhp (93 kW). The four-speed gearbox had synchromesh on the top 3 ratios. Brakes were by Girling. The complete car advised aloof over 23 cwt (2600 pounds, 1150 kg).