Please, help me with removing pass. exhaust manifold

[cfan10]

Can someone please tell me what I am doing wrong, pass side exhaust manifold is cracked. I've undone the bolts from the block, but the top has this square like bolts that will not budge with adjust wrench, also cannot get bolts loose that connect to the exhaust pipes using long 9/16 socket.
Is there a way to get this done without an impact gun? Thanks so much for advice.
Also, pass exhaust pipe is twisted under bed of truck now, I know because muffler is crooked.


85 swb
305 v8
Dual exhaust
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[motornut]

i"ll be doin this later,got my mufflers in
if rusted solid and not being reused,snap off the 9/16 up to the manifolds
I will hit the manifold bolt straight on before turning,trying to shock/loosen it a bit

when you put new nuts on the exhaust consider brass nuts!
they don't rust

[76Charlie]

Try using PB blaster, make sure it doesn't get into the engine or anything bad like that, or use WD40. then put the wrench on it, and hit it with a rubber mallet

[cfan10]

What am I missing here, I tried still nothing. Square bolts that goes into head, not engine block. Anymore advice is appreciated. Thanks.
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[76Charlie]

Torch? wait for someone else to chime in before you try that though! don't wanna mess anything up

[Phillip Pennartz]

Those square like bolts might be pipe plugs used when the air injector tubes are removed.
Might just cut exhaust since its twisted, easier than getting some really stuck bolts that hold the pipe on.

[motornut]

it's not the "other" temp sending spot? coolant?
does the manifold look like this?

[motornut]

or

[cfan10]

Originally Posted by motornut

or

That is the location on the square bolt, unlike the pic it has no connections to it. And it is 2 bolts, 1 is thru the first hole on engine, the other is at the back of engine by motor oil dipstick.
My dumb (smartphone) will not let me upload pics to photobucket, or vids to youtube. I will keep trying. Thanks.
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[88Jimmy4x4]

Originally Posted by cfan10

That is the location on the square bolt, unlike the pic it has no connections to it. And it is 2 bolts, 1 is thru the first hole on engine, the other is at the back of engine by motor oil dipstick.
My dumb (smartphone) will not let me upload pics to photobucket, or vids to youtube. I will keep trying. Thanks.
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if thats them, then you shouldnt have to remove them as they dont screw into the block

[motornut]

Originally Posted by 88jimmy4x4

if thats them, then you shouldnt have to remove them as they dont screw into the block

x2

[cfan10]

Its the same location at the top of exhaust manifold, but is not the same thing. The bolt on mine goes from that location into the exhaust manifold hole on engine block. Not to be confused with the six bolts on the exhaust manifold.
These square bolts are the only thing holding the exhaust manifold up, as the six bolts have been removed without trouble.
I am thinking this is why it stayed cracked so long, its a pain in the ass to deal with. May end up putting it back. Thanks.
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[cfan10]

Its the same location at the top of exhaust manifold, but is not the same thing. The bolt on mine goes from that location into the exhaust manifold hole on engine block. Not to be confused with the six bolts on the exhaust manifold.
These square bolts are the only thing holding the exhaust manifold up, as the six bolts have been removed without trouble.
I am thinking this is why it stayed cracked so long, its a pain in the ass to deal with. May end up putting it back. Thanks.
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[cfan10]

Sorry for the double post. Even tried vise pilers, smaller socket.
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[motornut]

Suggest posting a picture
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[cfan10]

Can't because my phone will not upload.
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[88Jimmy4x4]

here it is

[jjzepplin]

That looks like an old plugged air-injection tube. With the flange bolts loose from the exhaust that should just come out. I don't think that is a bolt or has any function at all. You could just cut it off but you risk it falling into the cylinder. If you do cut it off turn the engine over til the exhaust valve is closed. If you take the motor mount bolts loose and lift the engine you may get enough room to pull it straight out. Since your manifold is of no use to you don't worry about hurting it.

[motornut]

wedge it from moving...vise grips
couple of nicks/cuts into both sides,
with a grinder/ cutting wheel,
hammer it ,
bet it would crack off

heck hitting it with a small sledge alone, might crack that

[cfan10]

Originally Posted by 88Jimmy4x4

here it is

Thanks so much, I really appreciate it!
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[IHeartGroceries]

Sorry for the thread revival, but I am in a pickle.

I have a 72 C-10, 350/350, and one of the nuts on the driver side exhaust mani (manifold to exhaust flange) backed out and fell off. The stud is good. I need dimensions of the nut size. The hex is 9/16", but what thread type?
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[LynnJr]

If its all original everything on the exhaust is 3/8-16 threads