The "Index de Performance" at Le Mans, a handicap competition run concurrently with the 24 hour race, had been a traditional preserve of the French, with Panhard (or Panhard engined ) cars winning 5 out of the previous 6 years (1951-56).
The Lotus Eleven had won the 1100cc class at the first attempt, in 1956. For 1957 Lotus entered three 1100cc cars, and the lone, experimental 750cc car, with a stroked and linered Coventry Climax, to contest the Index.
This tiny car, with only 59bhp "on tap", was a sensation in practice, breaking the class record by no less than 20 seconds.
In the race, Allison and Hall simply ran away from the class opposition, winning the index by a huge margin, coming 14th overall, at 90.02 mph.