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Exhaust manifold bolts

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  • 2 weeks later...

I had to pull the head on my 5.3 recently, and I found that the very 1st and very last exhaust manifold bolts were both broken by a previous owner. To my surprise, all the other bolts came out with no problems at all. I drilled out the center of the broken bolts, and they came right out using a square easy out. I followed the OEM directions on re-installation, and everything has been good to go. As far as the size goes, I would just use what ever you have on hand, or buy some on Amazon. If you are torquing them correctly, I don't see why the bolt head size would matter at all. The instructions call for threadlocker/locktite and a specific torque spec, possibly with a 1st and 2nd pass if memory serves.

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