A modernised variant of the wartime ISU-152 was developed in 1956. It used a new engine, that of the:T-54, with a cooling system and a heater. The capacity of the main internal fuel tank was increased to 920 litres, which added 500:km more to the vehicle range on a road. The gun had a maximum range of 13,000 metres. It received a new commander's cupola, and also new sights. The running gear used many elements of the:T-10. The modernisation was carried out in the:Leningrad Kirov Plant.