Exhaust gaskets???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71 3/4 ton · 10-08-2008, 12:40 PM

i have 3 exhaust leaks cause by blown out exhaust gaskets
i have replaced them 3 times and cant figure out why they keep blowing out
should i put performance gaskets on? and if so where can i get them?
what else could the problem be??

lowriden58 · 10-08-2008, 12:50 PM

manifolds or headers?

cdowns · 10-08-2008, 01:20 PM

i've always liked the deadsoft copper gaskets weather headers or manifolds// dont over tighten the exhaust because with wexpansion while hot they can mush cut and generally help the gaskets fail

thirdstreettito · 10-08-2008, 01:25 PM

COPPER! Lemons headers(Custom made to order headers)recommends copper. It is flat and NEVER leaks.

**El Jay** · 10-08-2008, 04:07 PM

Copper.

I got tired of burning/blowing out exhaust gaskets. I finally went to copper & haven't had a problem since.

I developed an exhaust leak when a header bolt backed out.
I retightened the bolt, the leak went away and the gasket was fine.

That's my.02

**leddzepp** · 10-08-2008, 04:15 PM

I have heard from some people not to even use gaskets between the exhaust manifold and the head...just tighten down real well.

lowriden58 · 10-08-2008, 04:27 PM

Quote:

Originally Posted by leddzepp

I have heard from some people not to even use gaskets between the exhaust manifold and the head...just tighten down real well.

thats why i asked him if he was running manifolds or headers

Longhorn Man · 10-08-2008, 04:41 PM

the question can't be answered till the OP answers lowriden's questions.
We also need to know if he is talking about gaskets on top, to the head, or on the bottom, to the pipe.

spudly · 01-14-2009, 02:49 PM

I've got a manifold leak right now and I'm planning on redoing the exhaust all the way back using the stock headers.

So, would a copper manifold gasket be the best choice? And what would be the best choice for a flange gasket at the pipe? Part numbers are appreciated if you have them

This would be on a stock '71 350.

70GMCer · 01-14-2009, 02:55 PM

I didn't have any luck with the copper ones. I went and used the stock OEM manifold gaskets & never had a leak again. And that's using headers also.

STOCKISH · 01-14-2009, 05:04 PM

I've always used the factory gaskets for manifolds with my headers. NEVER had a leak. Also, I use 3 inch doughnut gaskets where the collector bolts to the header,also never leaked.

10-08-2008, 12:40 PM	#1
71 3/4 ton Registered User Join Date: Oct 2006 Location: spokane Posts: 51	Exhaust gaskets???? i have 3 exhaust leaks cause by blown out exhaust gaskets i have replaced them 3 times and cant figure out why they keep blowing out should i put performance gaskets on? and if so where can i get them? what else could the problem be??

10-08-2008, 12:50 PM	#2
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Re: Exhaust gaskets???? manifolds or headers? __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg

10-08-2008, 01:20 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Exhaust gaskets???? i've always liked the deadsoft copper gaskets weather headers or manifolds// dont over tighten the exhaust because with wexpansion while hot they can mush cut and generally help the gaskets fail __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-08-2008, 01:25 PM	#4
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	Re: Exhaust gaskets???? COPPER! Lemons headers(Custom made to order headers)recommends copper. It is flat and NEVER leaks. __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck

10-08-2008, 04:07 PM	#5
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Exhaust gaskets???? Copper. I got tired of burning/blowing out exhaust gaskets. I finally went to copper & haven't had a problem since. I developed an exhaust leak when a header bolt backed out. I retightened the bolt, the leak went away and the gasket was fine. That's my.02 __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

10-08-2008, 04:15 PM	#6
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,997	Re: Exhaust gaskets???? I have heard from some people not to even use gaskets between the exhaust manifold and the head...just tighten down real well. Last edited by leddzepp; 10-08-2008 at 04:15 PM.

10-08-2008, 04:41 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Exhaust gaskets???? the question can't be answered till the OP answers lowriden's questions. We also need to know if he is talking about gaskets on top, to the head, or on the bottom, to the pipe.

01-14-2009, 02:49 PM	#9
spudly Registered User Join Date: Dec 2007 Location: Newark, CA Posts: 127	Re: Exhaust gaskets???? I've got a manifold leak right now and I'm planning on redoing the exhaust all the way back using the stock headers. So, would a copper manifold gasket be the best choice? And what would be the best choice for a flange gasket at the pipe? Part numbers are appreciated if you have them This would be on a stock '71 350. Last edited by spudly; 01-14-2009 at 02:49 PM.

01-14-2009, 02:55 PM	#10
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Exhaust gaskets???? I didn't have any luck with the copper ones. I went and used the stock OEM manifold gaskets & never had a leak again. And that's using headers also. __________________ 1997 GMC Sierra Ext 1965 Mustang

01-14-2009, 05:04 PM	#11
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Exhaust gaskets???? I've always used the factory gaskets for manifolds with my headers. NEVER had a leak. Also, I use 3 inch doughnut gaskets where the collector bolts to the header,also never leaked. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.



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