Youtube can be quite amazing especially when finding gems such as this. Here is a 1915 Indian 8 Valve Boardtrack Racer with ported cylinder heads that was found dismantled in an Australian vintage bike collection by the fine folks over at Yesterdays in the Netherlands.
These guys seem to have quite an interesting collection of bikes being restored and sold in the form of an auction house. Great to see them keeping all the old iron alive in Europe. Hell, dig through their site just for the great photos on tap.