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Having spent half an hour with the digital calipers I think I can confirm this engine did not come from a Ducati.
The swinging arm hole on the chain side measures (average of 3 measurements in each axis) 20.7 mm North/South and 22.47 mm East/West (so 1.77 mm oval) on the clutch side the hole is 20.27 mm N/S and 22.00 mm E/W (so 1.73 mm oval).
A Ducati SA spindle is 20 mm diameter and the smallest needle roller bearing with a 20 mm ID is 26 mm OD so these cases have never had a SA bearing.
As it stands the engine is scrap, it cannot be used in a Cagiva without the crankcases being bored and sleeved and it cannot be used in a Ducati without the crankcases being bored to accept needle roller SA bearings. I have no desire to acquire a Cagiva Elephant but I do have lots of Monster spares that could almost make a complete bike.
I have a cunning plan to enable the crankcases to be taken out to accept Ducati SA needle roller bearings involving some 10 mm aluminium plate (250 mm x 80 mm) and a steel bar (45 mm diameter x 70 mm long) both of which are sitting in my scrap bin.
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