ven those keen to boost current Formula 1 grid sizes by allowing works machines entered by BRM for the 1971 Canadian Grand Prix at Mosport Park: #28 George Eaton (), #31 Helmut Marko, #15 Peter Gethin, #16 Howden Ganley and #14 Jo Siffert. In contrast to the previous two rounds, won by Siffert (Austria) and Gethin (Italy), Canada was a washout – Ganley crashed in the warm-up, front-row starter Siffert could manage no higher than ninth, Marko was 12th, Gethin 14th and Eaton 15th.
