exhaust Manifold removal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

turner16 · 11-11-2010, 09:29 PM

How hard would it be to remove the exhaust manifolds from my 80 2500, 350ci
Would the bolts break? Any tips?

**old Rusty C10** · 11-11-2010, 10:56 PM

anytime ive had to do a motor swap i like to use PB Blaster or the like on the bolts the night before...i break em loose and back em out some then bring em in some and ease em out...ive never broke one yet

Oilbrnr · 11-11-2010, 11:05 PM

^^^ x2

*nbpro* · 11-11-2010, 11:29 PM

^^^ x3

benoit454 · 11-11-2010, 11:36 PM

a 50/50 mix of acetone and atf is supposed to work far better then any pb blaster, wd40, kroil, liquid wrench whatever. I use an impact, it works alot better then a ratchet.

*nbpro* · 11-11-2010, 11:41 PM

the acetone and atf may work better but around here buying acetone will get you followed home by the cops. has something to do with crystal meth.

benoit454 · 11-11-2010, 11:52 PM

figures, they'd end up doing that here too probably. I never tried it but want to, LOL not making meth and not having cops follow me home. But try it as a penetrating oil to break apart rusty crap.

*nbpro* · 11-12-2010, 12:03 AM

(yeah my stepdad bought some to clean his tranny pan gasket off with. idk if someone saw it, but probaby had to, but they came over and said they had gotten a call for a disturbance, walked straight to it, and asked what he was doing with it. )

benoit454 · 11-12-2010, 12:27 AM

wow.

mongoose · 11-12-2010, 12:59 AM

hit em with a bar then back them out with a gun... will never break one doign that.. and it's the fastest way as well.

GMC91 · 11-12-2010, 09:50 AM

Quote:

Originally Posted by nbpro

(yeah my stepdad bought some to clean his tranny pan gasket off with. idk if someone saw it, but probaby had to, but they came over and said they had gotten a call for a disturbance, walked straight to it, and asked what he was doing with it. )

Really now? I have went to wal-mart at 2 in the morning to buy acetone, walked past cops going out and not one has ever said anything to me. Thats weird...

jasonroman · 11-12-2010, 10:25 AM

Quote:

Originally Posted by mongoose

hit em with a bar then back them out with a gun... will never break one doign that.. and it's the fastest way as well.

hit em with a bar in back??
i have headers in the basement. didnt know if i should try putting them on or pay to have it done.
what needs to be moved in bay to get to all the bolts?

Prerunner1982 · 11-12-2010, 11:01 AM

If you have A/C you will need to remove the compressor and cut a part of the bracket off to fit over the front header tube.You will most likely need a spacer on the first or 2nd bolt of the headers as well to put the A/C bracket back on. You may have to remove the alternator as well... but other than that it is really pretty straight forward. I wouldn't do this unless you are planning on taking the truck to the exhaust shop in a day or two as your headers most likely won't bolt up to your stock exhaust.

I could have made the cut cleaner and not so square but I was borrowing the tools and the shop (carpeted garage) so I needed to get it done. That and I almost got my head taken off with the sawzall but that is a different story. lol.

ol_skool_chevy · 11-12-2010, 11:23 AM

The key word here is soak soak soak soak.....you can"t soak exhaust manifold bolts enough. if they break you have to tap them out and heli coil them.
I hate doing it...if you break one play stupid and ask your buddy who knows how..

HTX86chevy · 11-12-2010, 09:13 PM

Quote:

Originally Posted by ol_skool_chevy

The key word here is soak soak soak soak.....you can"t soak exhaust manifold bolts enough. if they break you have to tap them out and heli coil them.
I hate doing it...if you break one play stupid and ask your buddy who knows how..

^^^^^^^ I do this all the time when I'm workin on my cars at my Pops' house. Lol bet he hates it, but it never fails!

turner16 · 11-12-2010, 10:13 PM

Good advice guys thanks, I may just go to the exhaust shop?
I have a pair of 91 mans, do you think they will fit on my 80? Both are 350 blocks.

Never would have guessed that thinning out Auto Transmission Fluid would work but it makes sense. I only your acetone to clean.

motornut · 11-12-2010, 11:34 PM

i snapped a couple off but had just a nib sticking out,welded on a nut and used a torch held into the head where the bolt would go into,out they came

11-11-2010, 09:29 PM	#1
turner16 Registered User Join Date: Sep 2010 Location: Ajax, Ontario Posts: 214	exhaust Manifold removal How hard would it be to remove the exhaust manifolds from my 80 2500, 350ci Would the bolts break? Any tips?

11-11-2010, 10:56 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: exhaust Manifold removal anytime ive had to do a motor swap i like to use PB Blaster or the like on the bolts the night before...i break em loose and back em out some then bring em in some and ease em out...ive never broke one yet __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-11-2010, 11:05 PM	#3
Oilbrnr Registered User Join Date: Feb 2009 Location: Scottsdale, AZ Posts: 390	Re: exhaust Manifold removal ^^^ x2 __________________ -Don- '66 C10 w/factory A/C '77 Cheyenne K5 350/465/205 '80 Custom Deluxe K20 350/465/205 '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf

11-11-2010, 11:29 PM	#4
nbpro Account Suspended Join Date: Dec 2008 Location: Huntsville,AL Posts: 2,119	Re: exhaust Manifold removal ^^^ x3

11-11-2010, 11:36 PM	#5
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: exhaust Manifold removal a 50/50 mix of acetone and atf is supposed to work far better then any pb blaster, wd40, kroil, liquid wrench whatever. I use an impact, it works alot better then a ratchet. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

11-11-2010, 11:41 PM	#6
nbpro Account Suspended Join Date: Dec 2008 Location: Huntsville,AL Posts: 2,119	Re: exhaust Manifold removal the acetone and atf may work better but around here buying acetone will get you followed home by the cops. has something to do with crystal meth.

11-11-2010, 11:52 PM	#7
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: exhaust Manifold removal figures, they'd end up doing that here too probably. I never tried it but want to, LOL not making meth and not having cops follow me home. But try it as a penetrating oil to break apart rusty crap. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

11-12-2010, 12:03 AM	#8
nbpro Account Suspended Join Date: Dec 2008 Location: Huntsville,AL Posts: 2,119	Re: exhaust Manifold removal (yeah my stepdad bought some to clean his tranny pan gasket off with. idk if someone saw it, but probaby had to, but they came over and said they had gotten a call for a disturbance, walked straight to it, and asked what he was doing with it. ) Last edited by nbpro; 11-12-2010 at 12:09 AM.

11-12-2010, 12:27 AM	#9
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: exhaust Manifold removal wow. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

11-12-2010, 12:59 AM	#10
mongoose Registered User Join Date: Feb 2009 Location: slurrey, bc. Posts: 1,134	Re: exhaust Manifold removal hit em with a bar then back them out with a gun... will never break one doign that.. and it's the fastest way as well. __________________ -'73 c/10 - Low with Go - will be complete... probably never. -'90 2wd Blazer - well... soon enough anyways. -'84 SWB - the daily gas guzzler.

11-12-2010, 11:01 AM	#13
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	Re: exhaust Manifold removal If you have A/C you will need to remove the compressor and cut a part of the bracket off to fit over the front header tube.You will most likely need a spacer on the first or 2nd bolt of the headers as well to put the A/C bracket back on. You may have to remove the alternator as well... but other than that it is really pretty straight forward. I wouldn't do this unless you are planning on taking the truck to the exhaust shop in a day or two as your headers most likely won't bolt up to your stock exhaust. I could have made the cut cleaner and not so square but I was borrowing the tools and the shop (carpeted garage) so I needed to get it done. That and I almost got my head taken off with the sawzall but that is a different story. lol. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call Last edited by Prerunner1982; 11-12-2010 at 11:05 AM.

11-12-2010, 11:23 AM	#14
ol_skool_chevy Registered User Join Date: May 2010 Location: Hillsboro, Oregon 97123 Posts: 1,300	Re: exhaust Manifold removal The key word here is soak soak soak soak.....you can"t soak exhaust manifold bolts enough. if they break you have to tap them out and heli coil them. I hate doing it...if you break one play stupid and ask your buddy who knows how.. __________________ Measure with a yard stick Mark with Chalk Cut with a torch Built it yourself, don't count on others to to do it for you or with you. It will never get done

11-12-2010, 10:13 PM	#16
turner16 Registered User Join Date: Sep 2010 Location: Ajax, Ontario Posts: 214	Re: exhaust Manifold removal Good advice guys thanks, I may just go to the exhaust shop? I have a pair of 91 mans, do you think they will fit on my 80? Both are 350 blocks. Never would have guessed that thinning out Auto Transmission Fluid would work but it makes sense. I only your acetone to clean.

11-12-2010, 11:34 PM	#17
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: exhaust Manifold removal i snapped a couple off but had just a nib sticking out,welded on a nut and used a torch held into the head where the bolt would go into,out they came __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350



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