smaller engine model was purely to homologate for racing in sub-1000cc capacity classes, only 961 were built with 970 cc engines and the model was discontinued in April 1965. The engined models continued through the Mk2 Mini, finally being killed off in 1971 in the Mk3 bodyshell. The Cooper S version was also used by some British police departments and the Australian Traffic police as a plainclothes car. The engine was a BMC A-series Inline-4 OHV 2 valves per cylinder, producing a maximum power of @ 6000 rpm and a maximum torque of @ 3000 rpm. Upgrades The suspension in all UK models was replaced by a Hydrolastic system in 1964. The new suspension created a softer ride, but it also increased weight and production cost; in 1969 the original rubber suspension reappeared except on 1275 GT, Clubman and Cooper S models. Many other production changes occurred over the life of the Mark I Mini. In Australia, 1965 saw the release of the redesigned Australian Morris Mini Deluxe. The new model featured redesigned doors with conventional interior handles and wind up windows (with quarter vents), hydrolastic suspension, key operated starter, a remote gearshift mechanism (like the Cooper) and the engine was upgraded to the 998 cc version. Production of the Australian Morris Mini Deluxe continued until 1969 when it was replaced with another Australian only model, the Mini K the "K" stands for Kangaroo. The K received the more powerful 1098 cc engine (from the Morris 1100) as well as 4-speed synchromesh transmission and upgraded instruments. It was claimed that the Mini K was produced with 80% local content. Both of the Australia only round-nosed minis were based on the UK Mark I Mini with the production changes from the Mark II Mini never being used in Australia. Production of the round-nosed mini in Australia halted in 1970 with the release of the new Mini Clubman. The Australian Mini Clubman utilised the same locally designed wind up windows and exterior door hinges as the Morris Mini Deluxe. The Australian Mini had wind up windows many years before their British counterparts. Mark I Mini production changes for UK built cars Chassis numbers for production changes are given in italics, where necessary in the format Austin/Morris 1959 26 August 1959 - 101 - The first Mini launched, the Austin Seven and Morris Mini-Minor August - 4232/4093 - Split radiator cowl August -