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Old 10-08-2011, 08:09 AM   #1
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Header Gaskets - Copper or Carbon?

Gents -

Having problems with small exhaust leaks, keep blowing the regular header gaskets (passenger side). Odds are the header flange is less than perfect.

What are your thoughts on the copper Mr. Gasket vs carbon (Percy's) header gaskets?

Also, any real advantage to separating the ports (cutting the gaskets)?

Thanks,

Archer
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Old 10-09-2011, 05:14 AM   #2
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I can't speak to the gaskets you asked about, I'm trying the copper gaskets for the first time. In the past I used some Mr Gasket premium exhaust gaskets that looked to be loaded graphite, and I used them over and over with no leaks. I have not seen those particular gaskets in years tho. Maybe they were too good and the supplier wasn't selling wnough?

One thing I have always done that seems to help is not seperating the gaskets, but cutting the flange between the front, center two, and rear tubes. It seems this lets the ports seal a little better in each place, maybe due to there being a flex to allow the ports to sit flatter and not be stressed along the length of the head. Only two cuts per side, do not cut between the center two tubes.
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Old 10-09-2011, 06:46 AM   #3
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Buck -

Thanks, I've already made a cut in the flange near the port with the leak, and I'm just talking about a "regular" ticking sound. It's a real tight fit in there, so I'd like to just try a "better" gasket material and see if that helps. Anything else requires completely removing the header and that's not a fun job.

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Old 10-10-2011, 05:41 AM   #4
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Two thumbs up for Percy's.
If you use Copper Dont Over Tighten
use 15 ft lbs.
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Old 10-12-2011, 11:54 AM   #5
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When you pull the old gasket look for the burn mark thru the gasket. Most likely that's where you lost seal. I have had luck using two gaskets when an uneven flange is at fault and even used ultra high temp sealant on the suspect port. Good Luck!
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Old 10-12-2011, 12:02 PM   #6
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PK -

Thanks, did the double gasket thing last year, but used std gaskets. Lasted for a while, but not permanent. Haven't tried a sealant yet, though. Wanted to see what material would/should give the best seal "IF" the header flanges were less than perfect.

Problem is that a 440 + a 74 Charger = a really tight fit and I really don't want to keep repeating the exercise.

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Old 10-12-2011, 02:44 PM   #7
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Archer,kept blowing out header gaskets on the driver's side.Put on the MrG. copper gasket,that was 4 years ago and still good!
http://www.summitracing.com/parts/MRG-7167/

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Old 10-12-2011, 06:02 PM   #8
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John -

That's what I wanted to hear!

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Old 11-17-2011, 07:47 PM   #9
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I have an old set of not even close to strait headers. I used stock gaskets when they were new and they sealed until I bent a valve and had to take my heads off. I tried several times and they never sealed again.

I bought some soft aluminum exhaust gaskets called perceys seal 4 good. They sealed perfectly. Even better, I eventually changed engines and I reused the same gaskets. Still no leak. I would recommend as one of the best products.http://www.summitracing.com/parts/PHP-66036/
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Old 11-18-2011, 05:13 AM   #10
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Condor -

Didn't see those - THANKS!

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Old 06-14-2012, 09:15 AM   #11
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Gents -

Just to bring back an old thread.

Any body hear of/use Remflex graphite header gaskets???

Tks

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Old 06-14-2012, 04:40 PM   #12
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I ordered a set Saturday. They will be here on Monday. I had several colleagues say they are "problem solvers". I'm gonna try them. Price point wasn't that bad.


I'll measure them up thickness wise and take some good pics for fit and finish.
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Old 06-14-2012, 06:50 PM   #13
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PK -

Already have the gaskets based on local shop recommendations. They look good (thick and solid, but compressible), but given the clearance issues in the engine bay, I only want to do this job once (again).

I would like your take on them.

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Old 06-14-2012, 08:22 PM   #14
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Remflex is the way to go. An f-body gent just got them on his car and they sealed his warped headers.

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Old 06-15-2012, 04:04 AM   #15
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Eric -

Thanks!

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Old 06-18-2012, 05:42 PM   #16
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Remflex Header Gasket Review.

Installed the gaskets. They are very well made. No frays or bad cuts. The material is very thick and compressible. The measured a thickness of .1445 uniformly.

I have a heavy flange on my headers and seated these from the inside out to avoid over compressing them. Directions call for a "recommended" 20 ft pounds. Started with zero leaks. Time will tell.......
Attached Images
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File Type: jpg Exhaust 2.JPG (38.0 KB, 4 views)
File Type: jpg Exhaust 3.JPG (34.0 KB, 2 views)
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Old 06-19-2012, 05:29 AM   #17
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PK -

Cool, thanks!

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Old 12-03-2012, 01:52 PM   #18
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Gents -

Quick (but tardy) follow up.

Have had the ramflex gaskets on for a while and no exhaust leaks. The do as advertised and fill any flange defects and seal nicely. Not cheap, but work!

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Old 12-03-2012, 02:01 PM   #19
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I will pay a bit extra for something that works any time , header leaks can be a bit%^5 to fix !!
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Old 12-03-2012, 02:01 PM
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