A while back I had the unique opportunity to shoot these photos while this 906 was being serviced by Carl Thompson and Armando. There are some very interesting photos in this gallery with details that we don't get to see often https://pbase.com/9146gt/image/31428678. This is a spare 906 engine https://pbase.com/9146gt/image/31428670 the real 906 motor was in the Carrera 6 https://pbase.com/9146gt/image/31428653 note the large port-hole Magnesium valve covers (the spare motor had the more common early 911 alloy covers).

This is the #66 Porsche 906 Carrera that was entered in 1967 at the 24-Hours of Le Mans, it came in at a respectable "8th overall". The drivers were "Christian Poirot" and "Gerhard Koch". Advance the timeline to exactly 3:39 on this YouTube video to see this Carrera 6 http://m.youtube.com/watch?v=VOwsyyMnsDc

Enjoy...