But, Swoosh, by doing the best job you will be releasing another great Commando engine to the world! That in itself is a worthy cause. You definitely have a combat crank case with the oil intake way at the front. The modification on that is an important one if an engine is to be run hard. (What Norton does not get run hard from time to time?) I would build it as well as I could reasonably afford even if it was just to keep it as a spare engine. (too bad about your agreement with the original owner.) In my view, every once in a while an entire Commando will fall out of my extra parts.