Oklacarcollecto said

This is not my best area I admitt but I am thinking there is a crack on one of the intake ports on one of the heads. When that valve is closed it could be sucking water across the intake resulting in water in all 8 cylinders.

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crackedback said

Still doesn't explain how all 8 got filled.

I have some Stock J heads $150/pr. Need a complete going through and 1 exhaust valve at a minimum.

You have a bore scope you can run down the intakes to look if it's coming from the port(s)? Maybe a HF quick rental... :)

Take a scribe and see if you can move any of the top row head stud washers.

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