Re: 4.7L Manifold bolts
I had an exhaust leak on the driver side manifold too. One of the bolt heads had broken off so I had to remove all the wiring out of the way from the top side in the engine bay for better access and I also removed the plastic in the fender well to give me access to the lower rear bolts. I then removed all the bolts and then the exhaust manifold. This left the broken bolt still in the engine. Just got some pliers and unscrewed it and replaced it with a grade 8.8 bolt. Messed up thing is that the bolt head ended up breaking again and it was the one I had replaced. I ended up using Grade 10.8 bolts and everything is still fine. Was able to put the heat shield back on with some of the stock bolts. Some had broke so I wasn't able to mount it exactly like stock. Sorry but don't remember the sizes.
If you plan on doing it yourself, once you get one of the bolts out, take it to the parts store and size it. That's what I had to do.
2006 Grand Cherokee 4.7L 4x4 w/ QT2, Full OME HD Lift, 265/70/17 General Grabber AT2's, Custom Intake, 29.5" Cherry bomb glass pack muffler w/ stock piping(didn't cost much but i love the sound) :D, Superchips flashpaq, Boston Acoustic audio system, 2 12" JL Audio W3's in a sealed enclosure. Kenwood amp 1000 watts rms, 1600 peak.