Was that oring broken? The key word may be "massively". Usually, if the oring fails (looses tension from heat) the compression pressurizes the cooling system, blowing out coolant immediately. This happened to our 125 GG but no coolant entered the lower end and only a few drops up top, I'm sure after it cooled down. Compression pressure is a lot more than cooling system pressure. Still, I'd go over every gasket surface.
Now the question is if it overheated and melted the inner oring, why?
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