[richtazz]

You may want to use a small piece of 2x4 across the jack saddle to distribute the weight across the pan. Failure to do so could crack the oil pan, especially if you have a cheap little jack where the saddle is only about 2" in diameter. The only thing tightening the bolts will do is risk breaking the aluminum manifold. The gasket has bought the farm (like they all do) and needs to be replaced. Fel-Pro makes a new, redesigned intake set (part #MS98003T) that addresses this issue and comes with the valve cover gaskets also. You should replace the oil pump drive o-ring (fel-Pro #70800) while it's apart (since you can't get to it without removing the upper plenum and throttle body) as this is another weak point on the 3100/3400 V-6's. I also use a small block Chevy paper gasket (Fel-Pro 70194) between the top of the block and the housing as added insurance if the o-ring fails again. Don't forget the thermostat (ac-Delco 131-124) because like the o-ring, it's a bear to change with everything assembled.