Every time I see CMI, or Merc headers I cringe. and get sick to my stomach.
THERE IS PROOF that they both leak. Eventually. I also have PROOF (via E-mail) why the Gen X came out. (they leak too BTW)
There are some ways to help, and extend life or reduce the chance of leakage but no sure cure. (Search of some of my older CMI posts, not typing it all over again)
The best thing you can do is use them as boat anchors. Until you do TEST them as much as you can and as often as you can, to avoid catastrophic engine issues. I’m afraid I have some motor issues again, but just afraid to check. I’m sure if I check and do a leak down I will be reaching for my 9 mill. and driving up to Wisconsin.
I will post on my other “header thread” when I get a few more beers down.

Maybe it's time to hear from the boys that use the Hardin hurricanes. If you're out there please let us know how you feel

Hurricanes,are made by Lightning Headers http://lightningheaders.com/

and? i couldn't find them on the site

You were right , Hardin Marine makes em . Been checking them out myself . Diamond Performance Parts ,Keith Eickert and CP Performance sell them also .

i would like to hear from the guys who are running the hurricane's. they are fairly new yet, i believe they have only been in production for less than two years.

let me clear this up,,,hardin only sells them,,,lightning builds them,,,maybe under a license ageement,,,thats why you wont see them on the lightning site,,,at least that is where mine came from,,,one season with the hurricans headers,so far iam happy

That's news to me . Can't figure why they don't sell their own product then . Makes no sense to me , go figure . Maybe CMI builds Lightnings' headers for them ..........lol

thanks

Does anyone know what years were the worst for the Merc Headers? Or are they all the years BAD?!