I agree with truracer20 and I also have never had a header gasket leak since using copper header gaskets (embossed). I have had my header gaskets on my Monte for probably 15 years now and had them off a half dozen times and I have never had a gasket issue and I use standard header bolts without Loctite and even with solid mounts throughout I never have had a header bolt come loose.
If you have issues they were either a misapplication, installed improperly or you some cheap no name brand.
If you have issues they were either a misapplication, installed improperly or you some cheap no name brand.
