I had to do the usual intake manifold gasket on my wife’s 3.4 lumina minivan a few weeks ago. I don’t think I will ever be buying anything else powered by GM; unless it says LS something on it.
the first time it happens you are supposed to retorque the head bolts. number 10 is usually the one thats loose.
i drained the oil, and it looks murky, and theres a bit of fuel in it, but no water. however, the front of the block is wet (nothing on the head). so i still think this HG is on the way out.
for now im just going to keep an eye on the oil, and coolant levels.