Offshoreonly.com - CMI HEADERS 700 BOAT LEAKING NEED lOPTIONS

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- - CMI HEADERS 700 BOAT LEAKING NEED lOPTIONS (https://www.offshoreonly.com/forums/general-boating-discussion/305543-cmi-headers-700-boat-leaking-need-loptions.html)

HyFive578

11-20-2013 06:16 PM

Quote:

Originally Posted by Scagburner (Post 4030193)

So the 2010 and newer Mercury headers are holding up better? Sorry for the questions but I just starting following the CMI saga..

Thanks,

I don't know if that's true, just was told that's when the manufacturing changed/improved...

blue thunder

11-20-2013 06:48 PM

PS I have always liked the KE Header[/QUOTE]

I have over 10yrs of hard running on 2 sets of KE headers with no issues ever. They are now called thunder n lightning headers as panther mentioned above. Best value and perf you can get from my experience.

northernoffshore

11-20-2013 07:02 PM

1 Attachment(s)

his outboard runs cmi also, the 557. wonder how these will hold up?

HyFive578

11-20-2013 07:04 PM

Quote:

Originally Posted by blue thunder (Post 4030287)

PS I have always liked the KE Header

I have over 10yrs of hard running on 2 sets of KE headers with no issues ever. They are now called thunder n lightning headers as panther mentioned above. Best value and perf you can get from my experience.

Will they attach easily to a 525/600/700 engine or are modifications required?

39 Unlimited

11-20-2013 07:06 PM

1 Attachment(s)

[QUOTE=neva satisfied;4030012]

Quote:

Originally Posted by Scagburner (Post 4029969)

Yes there is a way to tell. The old style outer tubes ran all the way down to the flange that bolts on to the motor. The Gen-X design does not. They taper in just before the flange. Maybe a half inch or so.

This might help. These are 2011 CMI's

39 Unlimited

11-20-2013 07:12 PM

1 Attachment(s)

[QUOTE=PARADOX;4030041]

Quote:

Originally Posted by HyFive578 (Post 4030038)

The "rubber" hose system is CMI, the solid water connection is Merc. The gen "X' headers have "turned down" area at the collector box to avoid back splash. With the square collection box, the lower tubes will allow water to the cylinders. or back wash from waves. Actually this came after I had some serious discussions with the CMI dudes.

Collector Box

PremierPOWER

11-20-2013 07:26 PM

3 Attachment(s)

Quote:

Originally Posted by HyFive578 (Post 4029945)

PPower: What headers did you put on the 600's?

Haven't ordered them yet (new long blocks just got in and getting ready to trailer them down to Florida tomorrow). Going to go with CMI gen x. That's what we went with in the Donzi, hopefully they hold up better being ordered direct through CMI and not through Merc

[ATTACH=CONFIG]512846[/ATTACH]

gofastlvr

11-20-2013 08:30 PM

Quote:

Originally Posted by gnorthga (Post 4030153)

Thank you for your 2-cents chad but cool is not my goal.

Reliable and making it to all stops is the plan.

Money is not a problem getting educated and sharing imformation is were I am coming from so I only do this once not two or three times.

Oh! how things going with the your new arrival.

They new arrival is baking away and due here in 7-8 weeks. We are as excited as we can be and he is kicking and moving all around. Just very very cool!

The headers from Teague are about as good as you are going to get and if Ron isn't a dealer give me a call and I will have them drop shipped down there with your boat. These are what you need as a replacement...

http://teaguecustommarine.com/gen-x-headers.html

and Merc lists headers for 525, 600, & 700's NLA (no longer avail.) but if I remember right they were 8K a set retail. You should be able to use your tails with these and Ron can check but this is about all there is out there any more.

H20 Toie

11-20-2013 08:38 PM

Quote:

Originally Posted by HyFive578 (Post 4030131)

Paradox (or anybody else)...

Any view on the Hardin Marine 525/600/700 headers. Are they better? Worse ?? I was originally steered away from them not because of quality but because of possible fit issues and the timetable I was on at the time. Now, I'm possibly looking at three sets of headers for a new boat I'm looking at and I have plenty of time. Are Hardin's a better option ? Anyone ??

Since i have already bought two sets of cmi's i am going to go with the Hardin marine ones hopefully they are better

PARADOX

11-20-2013 08:49 PM

[QUOTE=neva satisfied;4030012]

Quote:

Originally Posted by Scagburner (Post 4029969)

THe old.. old... style had double tubes all the way to the flange. Then the co. was sold, changed to the "cool collar" and then the Gen X came out, ALSO with the cool collar design. Prior to the Gen X the collar was the same as the Gen x as shown on the pic. CMI does make a military header, no "cool collar" bs. That's the way to go if you can get a set.

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