Exhaust Manifold Bolts?

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Old 08-25-07, 08:49 AM
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Exhaust Manifold Bolts?

1996 Camaro Z28 5.7L, While removing starter, had to remove cross-over pipe from driv side exh manifold. All 3 bolts snapped off at att point to manifold. (sprayed with industrial rust/bolt remover before-hand)
Thinkin re-install now, top side of remaining bolts feel like rivets in
triangular plate, was expecting bolt heads, or thread-studs with nut.

QUESTION: Have I just ruined exh manifold?
Should I go to muffler shop, let them heat, an replace broken bolts? I tried to hammer and chisel them out, no luck, not much room in Z28.

Finding manifold in junk yard I'm thinkin is very rare.

Any ideas out there? Thanks,,,
 
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Old 08-25-07, 09:33 AM
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Chances are these bolts were probably tack welded on. Saying this, you will probably have to find a new bracket/flange. I'm willing to bet there are many Z28's in the junkyard.

HAve you tried unscrewing those broken bolts with a pair of vise grips? They also maybe screwed in. Take a look at this link, and tell me if triangular piece is what you are talking about?

http://www.1aauto.com/1A/ExhaustManifolds/Chevrolet/Camaro/1AEEK00058/593343
 
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Old 08-25-07, 03:58 PM
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Yes, thats the triangular flange, only I would need the left hand manifold.
The flange feels like it is part of manifold, one piece? Flange is fairly heavy duty, maybe 1/2in thick.

Thanks for link, we may end up going that route, to a new part, have to call some bone yards.

Thanks,
 
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Old 08-26-07, 10:28 AM
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it's not uncommon for these to break, especially on higher mileage or winter driven vehicles. If you're comfortable with using a torch, I usually just heat them and remove with visegrips, it's been a while since I've done an F-car so you may have to remove the manifold to have enough clearance.

You could also bring the manifold to a machine or exhaust shop and I'm sure they'll be happy to remove the broken studs for you.

good luck
 
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