Some cars have scored more victories. Others have had longer careers. But few - if any - can match the impact of Porsche's first Le Mans 24 Hours winner, the 917.
Being the greatest in anything means more than just numbers. How do people feel about something? How did it move the game on? Does it still stop people in their tracks?
The 917 wasn't just a milestone car for Porsche, it was a seminal machine for motorsport.