I would go about 12 pounds. 30 is waaaay too tight. That's rod bolt territory. Have you checked the rubber O ring that goes between the intake manifold and the timing cover?? BTW, I've never used a torque wrench on a Pontiac timing cover. Just a 3/8 drive hand ratchet and "common sense".
Thanks for the feedback, I think you are correct.
Haven't taken anything apart and, FWIW, timing chain, cover, water pump, gaskets and seals were replaced about 5K miles ago. But, now that you mention it, is the o-ring in that one junction above (on top) of the cover where it meets the intake? There does appear to be stain on the cover underneath that point, it would naturally be likely to collect in the recess I mentioned.
I just got back from a 15 minute drive, and the leak appears to have stopped, so I am going to assume that tightening that one side (coincidentally underneath the intake-timing cover junction) proved effective.
I don't work on this stuff enough to be comfortable differentiating between what would seem like common sense and being covertly important, so I prefer to go the naive question route to the more experience when possible
As an aside, is it OK to further torque oil pan bolts to possibly reduce leaks, or is that a bad idea.