Several builders have taken the route of joining engines into a V configuration but Chris Ireland, editor of Brit Chopper magazine, sent me this photo of his just completed straight 8. The 6 month build is the combination of 2 1200cc NSU air cooled auto engines, joined end to end with the cranks running 90 degrees apart for that V8 sound and power delivery. He also attached a GMC supercharger for good measure. The distributor is a Rover unit chain driven from the end of the overhead cam..
The engine is slated for installation into a trike, which is the next part of the build, but, this could be used in all sorts of interesting things, limited only by imagination. Yes it's long and heavy, but it's very cool, too. Properly cleaned, painted and polished, it would really catch a motorhead's eye, actually, it already does. I like it!
Link: Brit Chopper