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That is something formed by Jim Wierzbicki who owns a Grand Prix with the L36. He makes lots of neat mods for our motor, and this one was meant to help performance. But, after reading this article, it might help with the manifold problem. Check it out
And, here is the exact part I am refering to:"This passage is partially protected by a metal sleeve that sticks up from the lower manifold, but that doesn’t keep the heat from the hot exhaust gas from damaging the upper manifold over the long term. When the plastic deteriorates, it exposes the coolant passages used to preheat the throttle body that are located on both sides of the EGR passage. Then, when the engine is shut off, the pressurized coolant runs down through the manifold, past an open intake valve and ends up hydrolocking one of the cylinders."
I don't know if the coolant plug will actually help, but I was just bringing it to light to see if it might be a fix. I have contacted Jim Wierzbicki about it to see if he believes his product could serve this function. Stay tuned
If you have the info on what the ISS relube costs, let me know. If the ISS creak comes back and they charge an "arm and a leg" we may just wait for the new car to come and not waste the $$$
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