 Complete the following phrase:  Back in Europe, only Brabham, Ferrari and Cooper had managed to secure a true 3-litre motor for their Formula One vehicles. Others, like BRM, were due to start the 1966 Formula One season with enlarged versions of their older engines. BRM did have the ambitious H16 engine in development, but for the first few races the team were forced to use the, by now two-year-old, P261. Despite this hindrance Jackie Stewart took first place at the season opening 