Originally Posted by Prados86gt
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.