Enjoyed that.
It appears from Wiki it beat a 1500 cc class Jowett Jupiter which won it's class as well yet only had 203 laps vs the 356 SL's 210 (1,100 cc).
In the link, more cars did not finish than finished. I have not researched but suspect this is not uncommon.
https://en.wikipedia.org/wiki/1951_24_Hours_of_Le_Mans