At some point, I dont know how long ago and it may still be an issue, but at some point the N/A engines had an issue with the Intake manifold (the black piece on top of the engine) warping and leaking coolant into the engine. My understanding was that it was due to heat from the EGR, which supposedly was later corrected by putting a shield around the EGR.

I have not heard of any issues with the N/A engine LIM, though that may not mean much.

That all said, looking at your picture, Im thinking your issue is more valve cover gasket related than anything. Is the back side of the engine the same way? Id be given that baby a long, detailed steam bath.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!