Humber Super Snipe Mark IV Saloon for 1953 feature a completely redesigned body of the full-width type, a new chassis with coil spring and wishbone IFS, and an entirely new 4-litre, six-cylinder OHV engine which develop 113 bhp at the unusually low speed of 3400 rpm. In the autumn the power gone up to 116 bhp the car beeing dsignated Mk IVA.
Imperial and Pullman gained the 4.1 litre overhead-valve "Blue Riband" engine with all synchromesh gearbox.