I came across these videoclips on google video - if you have others of the same kind, why not share them ?
The first one is a Porsche 956 around the Le Mans track, - which must make it 1982, - but the lack of pitbuildings etc makes the clip look older. Not sure, - but fascinating nevertheless.
http://video.google.com/videoplay?docid=-2842136813668496725&q=le+mans&hl=en There is also this 1968 lap - commentated by Sterling Moss. Video is not the best quality, but it takes you past Maison Blanche on full bore. The car should be a Ford GT40, and sounds like it too.
http://video.google.com/videoplay?docid=5351827155000673184&q=le+mans+lap&hl=en /Lennart