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how to remove welded in air injection

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Old Sep 25, 2008 | 12:50 PM
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Default how to remove welded in air injection

a previous owner removed the air pump but left the pipes that feed into the manifold. They seem to be welded, not bolted to it. Anyone get them removed/sealed or do I just need to look at some shorty headers?
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Old Sep 25, 2008 | 04:17 PM
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you sure they are really welded into the exhaust manifolds? Chances are they are just really tight. The constant heat cycles those threaded connections get can make it very difficult to remove them. Try heating them up with a torch than see if they will loosen up to unscrew out.

Oh - use a line wrench on those nuts are you WILL round them off as you are fighting with them


If Bubba really did weld them you are probably better off with another set of stock manifolds or headers
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Old Sep 25, 2008 | 04:30 PM
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Originally Posted by BarryK
you sure they are really welded into the exhaust manifolds?
Yup, don't think Bubba would have done all 8 of them (and it is a nice weld).

any other 81 owners out there look at their motor and see if this is the way they all are?
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Old Sep 25, 2008 | 04:52 PM
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Are your exhaust manifolds cast iron or tube steel? If you have the tube steel thats the way they came from the factory.
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Old Sep 25, 2008 | 08:09 PM
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The later manifolds are 409(?) stainless with welded in air tubes. You can just cut off the tubes at the manifold, then drill out the portion of the tube that sticks inside the pipe, and then weld the hole shut with stainless rod. Done a couple pairs of C3 manifolds this way.
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Old Sep 25, 2008 | 08:15 PM
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sorry, wasn't aware of the year of the car to realize we were discussing the steel manifolds - I automatically assumed the cast ones.
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Old Sep 25, 2008 | 11:08 PM
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Default tube type

yes these are the tube type. does the air pipe extend into the manifold? If you drill it out would not the extra fall down into the pipe? Or do you have to remove them from the car for this operation?
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Old Sep 26, 2008 | 12:18 AM
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The tubes do extend into the pipe and yes you need to remove them from the car to do about anything.
For all that just go with the shorties
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