That was close, but not correct. The problem is that water is not compressible, so when the piston comes up, it's like having a slug in your cylinder. You do not have to have high compression to bend the rod. If there was water in the cylinder when you took the head off, it got there while you were taking the head off. If there were to be measurable amounts of water in a cylinder, it would hydrolock, and the engine would seize.
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