By late summer in 1974, the team unveiled their first car, named the PC1, an aluminium monocoque chassis built around a Ford Cosworth DFV 3.0-litre V8 engine and a Hewland FG 400 gearbox. Penske Racing entered Formula One at the 1974 Canadian Grand Prix held at Mosport Park, Ontario, using seasoned driver Mark Donohue, who had driven for Penske in Indycar before being elevated to team manager of the US Penske operations. Donohue had retired from motorsport at the end of the 1973 season, but returned to full-time competitive driving for Penske in Formula One. Donohue had previously raced in Formula One in a Penske-sponsored McLaren in 1971, competing in two races, the Canadian Grand Prix and the United States Grand Prix.