Allis Chalmers HD5 coolant in oil.

My HD5 last ran 15 years ago. Drained the oil and found coolant. Engine is free. Coolant checked -40 degrees F with a hydrometer so I don't think it has a cracked blocked. Head gasket maybe. I read there are small copper tubes around the fuel injectors. Where else could it be from? Thanks
Larry
 
I think it may depend on how much you got out. Sitting for that many years moisture could have been created. If what came out was pretty green looking then I would say you may have a problem. not real familiar with that model. just sayng
 

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