C M I 's
 

What is the average lifespan of CMI headers from the mercury racing factory, installed on their 500 & 525 efi's ? Have any of you guys had them start leaking internally on you ? If so ,how many hours did you run them before they leaked ,and did their failure cost you more than a replacement set .......................(ie, valves,heads ,ect. ).I've heard a few different stories ,would like to hear yours:eureka:

Plenty of failures discussed with 525efi headers. The 500efi's have different headers.

Are they just as bad ? or do they have a better track record ,I'm looking at a boat with 500 efi's and 287 hours ,was wondering how much longer I can expect to get out of them ,and will I know when to change them before anything else gets damaged from them leaking ??????????????????????:(

TRICK has an extended warranty plan if you buy from them



Just Kidding.......don't take this advice :)

500EFI headers have not had the failure rate of the 525EFI. They are pretty much a standard CMI E Top. The 525 headers were spec'd out by Merc and they had Cmi build them.

Mine in a 382 with 500EFI's lasted for about 200 hours. Then needed complete engine rebuilds due to leaks into the heads. And that was even with regular fresh-water flushing.

Oh: needed new headers and tail-pipes, too.

The original Silent-Choice lasted even fewer hours.

Salt kills!

Wow that sucks, Did you keep the boat in year round ? any signs of leakage prior to head job ????????????????????:(

my cig has 300 hrs no problems with the headers yet on my 500 efis hope i didnt just jinks myself

stellings i had zero problems with mine..