BT19 also competed in the final two races of the 1965/66 Tasman Series in Australia, which was run to the pre-1961 Formula One regulations, including an engine capacity limit of 2.5 litres. Tasman racing was the original purpose of the Repco engine and Brabham's involvement was supposed to promote the 2.5-litre version. Frank Hallam, head of the Repco-Brabham organisation responsible for designing and building the Repco engines, has said that the smaller version "never put out the power per litre that the 3 litre engine produced",[37] which itself was not a powerful unit.