I installed my Mac headers and after reading allot of threads on the subject I saw that most people suggested the Gm metal gaskets and Stage 8's so I went ahead and bought the parts and I have a leak!! are these gaskets thick enough? if not which ones would be best?

Thanks.

 

I used Fel-Pro's when I did my ASM's last year, and have not had a leak yet.

 

I wanted to use Felpro's but evry one said that hey will not work the Mac's

 

how do you know you have a header leak??

 

I hear the sputtering sound from the pass side header and I can feel the exaust leaking out id I put my hand close to it.

 

did you take a 5/8 to the bolt to see if they are loose? i had mine and found a few loose. check em out and see

 

also make sure its not coming from the EGR fitting in the back of the header. This seems like a common place to leak to me.