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Old 04-13-2012, 07:14 PM   #1
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Mac long tube headers

I just bought some mac long tube headers. Now ive heard that they have a bad rep bc of a leak problem. And theres people that say that they dont leak. And im aware of the maintenance if heades such as tighten bolts often and proper and good quality gaskets. But are macs really that bad??
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Old 04-13-2012, 10:25 PM   #2
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Re: Mac long tube headers

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Originally Posted by Prados86gt View Post
I just bought some mac long tube headers. Now ive heard that they have a bad rep bc of a leak problem. And theres people that say that they dont leak. And im aware of the maintenance if heades such as tighten bolts often and proper and good quality gaskets. But are macs really that bad??
Yes, no , maybe.


You can get bad parts from any supplier.
Just check the flange port sealing surfaces and make sure they are smooth and level as possible.
I use the 1" long header bolts and I put a thin layer of Permatex Ultra Copper silicone on both sides of the gaskets and let it dry. Then right before you install them wipe a thin coat of grease over the silicone. I have done this for years with excellent results and I have been able to use the plain old paper gaskets several times over with this procedure.


Good luck.
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Old 04-14-2012, 01:37 AM   #3
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i have actually heard some good reviews with mac exhaust stuff.but i have no personal experience.
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Old 04-14-2012, 02:07 AM   #4
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What if the flange may be a little bent r crooked? Is it worth repairing or can it be?
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Old 04-14-2012, 03:20 AM   #5
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Old 04-14-2012, 03:35 AM   #6
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Re: Mac long tube headers

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What if the flange may be a little bent r crooked? Is it worth repairing or can it be?
They can be heated and straightened out.
Q. Is it worth repairing?
A. It's cheaper than a new set of headers.
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Old 04-14-2012, 03:57 AM   #7
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from the pic it is very hard to tell .but IMO i would try to make them work if i already had them.as TH suggested i would use the longer 1" bolts to make sure you get max holding strength if you have some extra stress on the fixxed area.

---------- Post added at 03:57 AM ---------- Previous post was at 03:56 AM ----------

did you run a straight edge over the mounting surface?
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Old 04-14-2012, 12:54 PM   #8
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Ok cool. And no havent runned a straight edge on it.
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