4.7 exhaust studs source?

The thing about those damn things is to not tighten down the heat shield nutd tight, just tight enough it doesnt rattle. The 2 different metal type of the manifolds and the sheild expanding and contracting front heating up and cooling down is what breaks the heads off the bolts. Even double nuts them if you'd like. I did both sides of my old Durango 4.7 and both sides of her 09 Aspen with the 5.7.