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You might want to remove the thermostat, I have seen for some reason bubbling caused by bad thermostats. The fire decks on road oiler heads are real thin if the coolant level ever gets below the fire deck you can bet the farm you are going to crack a head. If the head gets warped or isn't...

On a 2 stroke Detroit bubbles in the cooling system most likely indicates a cracked head. One of my first jobs out of active duty was rebuilding road oiler heads, and iron lungs (blowers). We magnafluxed every head, and threw out as many castings as we kept, it could also be a leaky copper...