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-   -   Headers on a 496 HO (https://www.offshoreonly.com/forums/general-boating-discussion/357513-headers-496-ho.html)

Monaco20 11-06-2018 03:21 AM

Thank you Griff now I know what kind of headers I might end up buying

1MOSES1 11-06-2018 06:39 AM

Personally I’d skip adding headers on a 496...the cons (leaking welds) far outweighs the benefits (looks and sound). Just my 0.02.

Keith Atlanta 11-06-2018 06:53 AM


Originally Posted by 1MOSES1 (Post 4657669)
Personally I’d skip adding headers on a 496...the cons (leaking welds) far outweighs the benefits (looks and sound). Just my 0.02.

Dana's are somewhat reliable and priced fair.

Monaco20 11-06-2018 07:04 AM

The reason I consider this option are because I need to change next season, engine are a 2009 model not changed before.
The CMI Split Top Headers are almost not used even though they have some years, and I can get them for 450 USD
I do not think they have any leaks but I are going to pressure test them anyway..
If they are ok, its a good deal ..
Keith Atlanta what kind of engines du you have in your Baja ??

BUP 11-06-2018 11:29 AM

not sure as I do not recall ---- Maybe when CMI first came out with marine headers - did they have external welds ? ?? Possible a knock off header ??. And Yes CMI did have headers like the ones in the pics but I do not recall being external welded.

Griff 11-06-2018 12:07 PM

The visible external welds are normal on satin finish CMI's from what I have owned and seen.
I think CMI smooths them out on the polished versions so they become virtually invisible.

Monaco20 11-06-2018 12:22 PM

I sent the pictures to Custom Marine and they confirmed that they are CMI top split headers sold in the 90s replaced by the CMI Sport Tubes

Price at the time they where sold aprox 3.500 usd

Baja Rooster 11-06-2018 12:27 PM

Personally, if I had it all to do over again I’d buy a good set of manifolds instead of the old CMI headers that I got. They were fresh water units and pressure checked, but a few months later my engine wouldn’t turn over because the #5 cylinder was full of water. Unless you’re going for a big power build with all brand new parts I’d stick with some good manifolds. That’s my $0.02. But best of luck however you go!

Keith Atlanta 11-06-2018 01:16 PM


Originally Posted by Monaco20 (Post 4657678)
The reason I consider this option are because I need to change next season, engine are a 2009 model not changed before.
The CMI Split Top Headers are almost not used even though they have some years, and I can get them for 450 USD
I do not think they have any leaks but I are going to pressure test them anyway.
If they are ok, its a good deal ..
Keith Atlanta what kind of engines du you have in your Baja ??

496's converted to Raylar 600 packages and Dana manifolds.

Monaco20 11-06-2018 01:30 PM

https://cimg9.ibsrv.net/gimg/www.off...f3801c0f99.png
Nice package, I have been thinking about install a Procharger on my 496 HO, with a mild boost 3,5 psi should give me aprox 550 HP


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