MustangsEatSi

I just bought some mac 1 3/4" shorty headers, and now i cant get them to seal. I have taken them off and reinstalled them twice, and now it only leaks out of the number 4, of course that is the tightest place to be because of all the emissons and crap. So if anyone has any ideas on how to get this one to seal, please let me know.

Moosetang

I think everyone has trouble with leaking. Buy Mac copper gaskets.

87mustang347

maybe u shood try some silacone aroumd that area idn if it wood work but its an idea

Milky

Unbolt them from the pipes, tighten the bolts to the heads, re-tighten to the pipes evenly, drive it for about 20-30 minutes and while its still warm tighten them again. Then when its cold tighten yet again... this process worked for me with the same headers

sofknez

I just got a set of MAC headers and had the same problem. turns out it was bad welds from the factory that was leaking. Called MAC new ones on the way. I Put this compond made for heat over the holes to seal till the new ones get here. Worked great

Obsol3te

I got some gaskets with i think it was an aluminum or so middle
dont know its kinda weird
Makes for a metal to metal seal tho

so im not leakin

mdvaldosta

and make sure you tighten the header bolts from the inside out

vfast

you should have got a set of copper gasket if you bought them from mac...try retightening them