 Complete the following phrase:  Alfa Romeo, unable to fund a new car, withdrew from racing, while BRM had been preparing two V16-powered cars for the season but withdrew them before an April race at Valentino Park, Turin, whilst attempting to enlist Juan Manuel Fangio as teammate to Stirling Moss, leaving Ferrari as the only serious Formula One contender. This led World Championship organizers to run their races for Formula Two, utilising 2-litre naturally aspirated engines, which meant larger fields and a greater variety of cars, even if the victories all went to Ferrari. Ascari won the six Grands Prix he entered, missing the 