Exhaust Manifold Bolts No Bueno

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Rocket Man

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There's a few ways to take care of those. Drill and ez-out; stick a nut over the ends and fill the interior with weld so the nut is welded to the stud and then back them out or a couple companies make clamps that bolt into the unused threaded holes in the block and then use another bolt to put pressure on the manifold. Dorman is one of those companies. Kral is another. There's ones for the fronts and rears and another for the centers.

 

GranPrix

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Damn sorry to hear. Does this usually happen up north?

BTW, LoL did you mean No Bueno? LoL
 

thompsoj22

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Dont stop now! the lower exhaust is off, loosen/shear the rest and replace the manifolds and hardware. Im guessing under $200 parts. You must have a great wife that dosent mind fedex delivering boxes on a daily basis with only your name on them lol!

Just a caution, im hoping others will add hands on experience with the removal of the bolt shanks, do they back out easily or are they locked/seized in place by corosion in which case id leave them alone.
 
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drakon543

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since there is quite a bit of bolt still sticking out past the block its not too bad to fix. if you want to try and remove the manifold just by loosening the bolts get some pb blaster and spray the bolts every day for about a week. preferably when your not about the drive it or its still hot obviously. you might get the rest to come out if you work them slowly. best option to not create extra work for yourself would be to just the head off the rest of the bolts and remove the manifold. stud extractor or vise grips and some more pb blaster should make short work on removing the remaining parts of the bolts. get a whole new bolt kit from arp or someplace similar and torque them down.
 

drakon543

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as annoying a problem as it is its more annoying its fairly common problem on alot of vehicles.
 

Derick

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Yeah a few bolts popped off on the suburban. I took it in for some exhaust service anyhow, so they took care of all the broken bolts too. From what I saw, GM used M10 heads, and they all broke. Replacement bolts are M12 and are far better.
 

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