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Monitoring crank case pressure might be the better way to go if you're thinking that route. I would expect if something is leaking that you'd see the most obvious pressure change there.
Though I would honestly think that the vibration signature and engine sound would be the first alert. If any cracks form, the resonant frequencies of the block will change as it becomes less stiff in certain areas. I would expect this to happen before any fluids start moving around.
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