In my experience as an automotive mechanic of 30 years I had a volvo engine do the same thing and after days of trying to figure it out I found that the aluminum block had a casting issue and was seeping through the block and I have seen it in the aluminum heads as well. I would think that if the engine is hydro locking the water is coming in to the cylinders through one of the cooling jackets in the heads . Not saying that's the problem but a good place to check.
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