Review on Dorman 03413 Exhaust Manifold Hardware Kit: Top Selections for Easy Installation by Raji Bentz
Good screw replacement for 4.2TB/Envoy/Ascender
Used with Trailblazer 4.2 splitter and others. I was lucky and didn't have any broken screws, but usually there are a few loose or broken screws. So before you begin, be aware that drilling/tapping may be required to reinstall the manifold. If you get a seemingly incurable lean code, look under the underhood exhaust heat shield for large cracks. I had a crack in cylinder 6 and around the O2 probe resulting in excessive fuel consumption. Also make sure the intake manifold bolts are tight while you are under the hood.
- High marks for support and durability from testers
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