Hillman Imp

The Hillman Imp is a small economy car made by the Rootes Group and its successor Chrysler Europe from 1963 until 1976. It was the first mass-produced car with the engine block and cylinder head cast in aluminium.

Being a direct competitor to the BMC's Mini, it used a space-saving rear-engine, rear-wheel-drive layout to allow as much luggage and passenger capacity as possible in both the rear and the front of the car. It used a unique opening rear hatch to allow luggage to be put into the back seat rest.

In addition to its aluminium engine, it was the first mass-produced British car to have an engine in the back and the first car to use a diaphragm spring clutch. The baulk-ring synchromesh unit for the transaxle compensated for the speeds of gear and shaft before engagement, which the Mini had suffered from during its early production years.

It incorporated many design features which were uncommon in cars until the late 1970s such as a folding rear bench seat, automatic choke and gauges for temperature, voltage and oil pressure.