Ferrari 's newer , unsupercharged 4.5 litre cars offered a real challenge to the Alfas , which were nearing the end of their development potential .
The season also included 14 races that were open to Formula One cars but did not count towards the championship standings .
Ferrari 's newer , unsupercharged 4.5 litre cars offered a real challenge to the Alfas , which were nearing the end of Formula One 's development potential .
The season also included 14 races that were open to Formula One cars but did not count towards the championship standings .