Re: Exhaust manifold bolt breaking?
Both my exhaust manifolds had the rear bolt head broke off. Unsure what is causing this but its not just on the hummers, the chevy garage had a tahoe in there with same rear bolt broke off.
Mechanic did same as you used vise grips to unscrew the stud (rest of bolt-head= stud) out.
If you hear an exhaust tick be assured its a broke bolt-
Chris
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