Re: GM 3.4 V6 lower intake gasket...
Don't know if you have done the repair yet, but you might want to consider replacing the oil drive o-ring and gasket while you have the intake manifold out. Cheap and easy to do when you are already there. Tip for reassembling, start all intake manifold bolts before you tighten any. Like sportsmanphil said Do Not Overtorque, GM says to do it in a three phase process. If you are reusing the manifold bolts use medium strenght (blue) loctite