Replacing exhaust manifold gasket? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sooner1970_K10 · 03-18-2005, 09:05 PM

I got some gaskets from Napa which dont require you to take the manifold completely off. They just slip down over the bolts. I know they arent the best but better than hearing an exhaust leak. My question is, what is the best way to get in at the exhaust manifold? I have A/C and the side that is leaking is on that side. Should I attempt to remove the fender well and go at it that way? Or should I remove the A/C crap and try to get to the manifold from the top? Thanks for any advice!

Brainchild · 03-18-2005, 09:35 PM

It's prolly easier just top remove the AC compressor,and move it out of the way.Tie it out ofthe way if needed.It would be a lot harder to go at it from the fenderwell I think.

dwaite72lnghrn · 03-18-2005, 10:12 PM

Not sure what engine you have but the air will be bolted to the manifold in the back. You should be able to get at it with a 6"+3" extension on a 3/8 drive socket under the compressor. If the blots are rusted bad pickup new ones for the manifold as they will probably break or round off alittle. most exhaust gaskets you take out the middle bolts and loosen the end bolts. Just something to think about How ya gonna get the old gasket off if it even has one? Most BBC from the factory didn't have a gasket. Don't know about SBC's.

67chevemall · 03-18-2005, 11:24 PM

How are your bolts If you SNAP one, loose n it your up the creek!
I would take the sucker off clean it all up put new studs on there
then slip your gaskets in there and tightn it up.
Noth n wrong with those gaskets. You mean the three to a side ones right?

Sooner1970_K10 · 03-19-2005, 05:50 AM

Yes, the gasket is made so that you can break it apart at 2 segments and end up with 3 smaller pieces. You have each end and then a double segment for the middle. Looks like it has a metal shell with rubber in it. My engine is a V8 350 and the passenger side has a pretty distinct exhaust manifold leak. I am wanting to get rid of the leak because I think it will help clear up some of the noise in the cab?

kaycee · 03-19-2005, 10:48 AM

Just unbolt it and put it out of the way like they said before make sure the old gaskets r out before installing new 1.Allso u may have 2 loosen the bolts at the flange to get some room behind manifold to clean.GOOD LUCK

WRMZ71 · 03-19-2005, 01:13 PM

Yep its frusturating that you have to take it off but I would in your case so you can properly scrape off all the old gasket material in there. Ya know if you don't want that A/C compressor in there I'll be more than happy to take it off your hands for ya!!!!

68speedalert · 03-19-2005, 01:45 PM

Unless your manifolds are pretty rough, I wouldn't use a gasket. They didn't come OEM with them. You will need to remove all the old material for a good seal.

71-longbed · 03-19-2005, 02:06 PM

i use those gaskets and they work great

68speedalert · 03-19-2005, 02:18 PM

Long term......gasket burn out, no gaskets.....well....can't.

03-18-2005, 09:05 PM	#1
Sooner1970_K10 1970 K10, 350, 4spd! Join Date: Jun 2004 Location: Shawnee, Ok Posts: 128	Replacing exhaust manifold gasket? I got some gaskets from Napa which dont require you to take the manifold completely off. They just slip down over the bolts. I know they arent the best but better than hearing an exhaust leak. My question is, what is the best way to get in at the exhaust manifold? I have A/C and the side that is leaking is on that side. Should I attempt to remove the fender well and go at it that way? Or should I remove the A/C crap and try to get to the manifold from the top? Thanks for any advice!

03-18-2005, 09:35 PM	#2
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	It's prolly easier just top remove the AC compressor,and move it out of the way.Tie it out ofthe way if needed.It would be a lot harder to go at it from the fenderwell I think. __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

03-18-2005, 10:12 PM	#3
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Not sure what engine you have but the air will be bolted to the manifold in the back. You should be able to get at it with a 6"+3" extension on a 3/8 drive socket under the compressor. If the blots are rusted bad pickup new ones for the manifold as they will probably break or round off alittle. most exhaust gaskets you take out the middle bolts and loosen the end bolts. Just something to think about How ya gonna get the old gasket off if it even has one? Most BBC from the factory didn't have a gasket. Don't know about SBC's. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

03-18-2005, 11:24 PM	#4
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	How are your bolts If you SNAP one, loose n it your up the creek! I would take the sucker off clean it all up put new studs on there then slip your gaskets in there and tightn it up. Noth n wrong with those gaskets. You mean the three to a side ones right? __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

03-19-2005, 10:48 AM	#6
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,445	Just unbolt it and put it out of the way like they said before make sure the old gaskets r out before installing new 1.Allso u may have 2 loosen the bolts at the flange to get some room behind manifold to clean.GOOD LUCK __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

03-19-2005, 05:50 AM	#5
Sooner1970_K10 1970 K10, 350, 4spd! Join Date: Jun 2004 Location: Shawnee, Ok Posts: 128	Yes, the gasket is made so that you can break it apart at 2 segments and end up with 3 smaller pieces. You have each end and then a double segment for the middle. Looks like it has a metal shell with rubber in it. My engine is a V8 350 and the passenger side has a pretty distinct exhaust manifold leak. I am wanting to get rid of the leak because I think it will help clear up some of the noise in the cab?

03-19-2005, 01:13 PM	#7
WRMZ71 Cause the Chicks DIG IT!! Join Date: Nov 2003 Location: Beaufort SC Posts: 509	Yep its frusturating that you have to take it off but I would in your case so you can properly scrape off all the old gasket material in there. Ya know if you don't want that A/C compressor in there I'll be more than happy to take it off your hands for ya!!!!

03-19-2005, 01:45 PM	#8
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	Unless your manifolds are pretty rough, I wouldn't use a gasket. They didn't come OEM with them. You will need to remove all the old material for a good seal. __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

03-19-2005, 02:06 PM	#9
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	i use those gaskets and they work great __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

03-19-2005, 02:18 PM	#10
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	Long term......gasket burn out, no gaskets.....well....can't. __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

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