Well the same buddy who scored the day cruiser in the other thread also owns a propane company. He has a 17' sanger, yes I said sanger Brodie, that runs a small block on propane. It runs in the mid/high 80's. All is stuff is pretty rough but the go out 2-3 times a week in it. Here is a motor shot.
http://www.schoutenranch.com/gallery...al_propane.jpg
http://www.schoutenranch.com/gallery...l_propane2.jpg