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1993-97 Gen II Small Block V8

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Old 04-18-2010, 07:35 PM   #1
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Default Copper Gaskets leak after Header install?

I just spent 20+ hours installing Pacesetter Long tubes on my 94 Z28. I was told to stay far away from the paper gaskets included with the new headers. With this in mind I bought a Mr. Gaskets set that are copper and bolted them on. I got the car all back together and started it, and both sides leaked like crazy. You can hear the ticking over the exhaust. I took them off and made sure I installed them the correct way (which I did). I really don't understand. I used "better" gaskets because I wanted to make sure I didn't skimp out and regret it later. Well now I regret not using paper. Any suggestions or explanations? Thanks, Kyle.
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Old 04-18-2010, 07:38 PM   #2
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We never use anything but Mr. Gasket Ultra Seal P/N 5903. I have never heard anything good about copper gaskets.

sorry to read this after knowing what you just went through
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Old 04-18-2010, 07:48 PM   #3
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try using a little bit of rtv just a thin coat enough to fill in the imperfections. works like a charm.


also are you sure it isnt the cheap U bolts leaking on the Y or I pipe?
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Old 04-18-2010, 07:55 PM   #4
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Ive ran Mr. Gasket Ultra Seals part #5965's for years with my longtubes and no problems at all.
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Old 04-18-2010, 07:59 PM   #5
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I tightened them down really tight and it still didn't result in anything that made me not want to put my head through a wall. I am really lost. I have no I idea what the problem is!
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Old 04-18-2010, 08:08 PM   #6
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Use a thin coating of the copper rtv on them should seal up good then. My buddy runs just the copper rtv by itself on his racecar.
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Old 04-18-2010, 08:13 PM   #7
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Quote:
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We never use anything but Mr. Gasket Ultra Seal P/N 5903. I have never heard anything good about copper gaskets.

sorry to read this after knowing what you just went through
Yep never had anything but problems with coppers for us too....I use the same gaskets that Larry suggested.


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Old 04-18-2010, 08:16 PM   #8
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Anytime I need to remove and replace my headers, I put high-temp RTV (orange) around the perimeter of each exhaust port and bolt hole on the new gasket. Works well.
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Old 04-18-2010, 08:17 PM   #9
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Quote:
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I tightened them down really tight and it still didn't result in anything that made me not want to put my head through a wall. I am really lost. I have no I idea what the problem is!
try the rtv, couldnt hurt, also while u have the headers loosened try to scrape away some of the carbon that can cause some of the leaking



and the u bolts that come with the PS LT's suck, get some real band clamps.
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Old 04-18-2010, 08:57 PM   #10
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Never had a problem with copper gaskets. Just drive around until they get real hot, then tighten them again.
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Old 04-18-2010, 09:45 PM   #11
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My percy's gaskets have never leaked. Had them for about 3 years
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Old 04-18-2010, 10:35 PM   #12
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LOL at the people who have to use RTV on their headers.

Felpro 1406s. x a billion.
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Old 04-18-2010, 11:02 PM   #13
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And does anyone else have trouble starting the header bolts correctly? Its a real pain in the ***.
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Old 04-19-2010, 08:48 AM   #14
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Quote:
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We never use anything but Mr. Gasket Ultra Seal P/N 5903. I have never heard anything good about copper gaskets.

sorry to read this after knowing what you just went through
Gone through that fun during the winter i used the Mr Gasket Coppers and same thing they wouldnt seal for a damn. Although i here you REALLY have to tighen them down for them to seal but no luck. I sent Larry an email what they used which was the Mr Gasket 5903s and first crank perfect seal. You will have to trim a bit of the gasket on the drivers side for the coolant sensor though but thats nothing. Its a royal pain to change out gaskets on these things and trust me use the 5903s!
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Old 05-02-2010, 06:26 PM   #15
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Exclamation I have the exact problem!!

I too have just installed Pacesetter LTs and know exactly how you feel. I also have a set of MR Gasket coppers. I read all the inputs on here and bought the $50 gaskets too!! Did you ever get the problem solved? To me it almost looks as if when you torque the header bolts it actualy moves the header down... I am concerned it may be a bad set of headers..
Any reply is appreciated! - Joe
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Old 05-02-2010, 06:39 PM   #16
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Quote:
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And does anyone else have trouble starting the header bolts correctly? Its a real pain in the ***.
I did on my ebay headers, could be a machining error on the header flange or maybe someone has retaped a hole in the head, regardless, you can oblong the problem hole side to side a little bit with a dremel or drill bit, just don't take of too much that cant be covered by the bolt head...just my 2 cents worked for me
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Old 05-02-2010, 08:48 PM   #17
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Do not try to use a sealant on exhaust ports or gaskets or on the flanges. Reason being is it's a mess and you have to clean it up every time you take your headers off. Besides if you do have a leak as bad as you say the sealant may work for a very short period of time before being burned off. It's possible there are just too many imperfections in the flange to get a good seal. Use a paper gasket and no sealant.
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Old 05-03-2010, 12:40 PM   #18
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I switched over to paper gaskets and the problem was gone completely. However now the Optispark crapped the bed. 34 hours on an install and I couldnt even drive it yet. Use paper gaskets.
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Old 05-03-2010, 01:42 PM   #19
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I too have Pace Setter lts,I tried using the MR.Gasket copper gaskets..BIG Mistake...Alot of people say that they just do not seal with the Pace Setter headers..I am using Fel pros with no problem now.
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Old 05-03-2010, 09:45 PM   #20
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copper gaskets here, had them for 3 years and no leakage. maybe i'm the lucky one?
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Old 05-03-2010, 09:45 PM
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2010, camaro, cooper, copper, exhaust, exhuast, gasket, gaskets, headers, installation, intake, leak, lt1, mr, port


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