Well yesterday, I actually helped someone do the headgasket on their S12.
This one suffered water getting into the combustion chambers, and the reason was due to the HG rotting from lack of anti-freeze.
However, there's one pressurized area, and its right beside a head bolt. Its the inlet side, 2nd one in from the rear.
In my opinion I'd be surprised that its rotten the gasket there though
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