Boat is still at the the builders.
They are waiting on Mercury to come up with a new elbow to help the cooling .
What Merc has will not work on the setup .Just a basic set up 4" exhaust above water line .
It is all on the mercury to come up with a or solution .
The Mercury Rep. been down there a few times from what I was told.

I was reading the board to see if there has been other problems.
My set up is basic. Something must be wrong and I'm not hearing anything .

Are the exhaust ports different from other bbc heads?

NO!
I have now CMI and checked with Gasgets! Exhaust ports are same than 502 or 496 Heads!
Standart Exhaust at engines without Cats are same than 496!
Michael

Update, my boat ran 76 mph with a 26 bravo and 80 mph with a labbed 28 bravo. This was with the stage 2 PCM upgrade from whipple. Stock it ran about 68-70. So that's a pretty damn good gain.

The jump from Mag with Cats to HO without is a big powergain.
Also your boat has a very fast,only 21 degree hull ,on straight water.
Maybe you let us know the RPM with your diffrent props??

I run last year 70mls at 4530 Rpm with 25 Mirage Plus.

I hope my 232 runs 75-76 with stage 2 and Cmi.I will see next day and let you know.My hull needs some more power i think.
Best Regards
Michael

"Update, my boat ran 76 mph with a 26 bravo and 80 mph with a labbed 28 bravo. This was with the stage 2 PCM upgrade from whipple. Stock it ran about 68-70. So that's a pretty damn good gain."


Very good results !

So no fix or any conclusions from Merc ? and how about the other guy that almost burned down his boat ? Just asking.

I know most likely will see this same problem at some point in time this year.

BUP>They change the S pipe to a full alum cast style .The one I had on there was some real nice fabricated stainless 90's deg bend style .I have see these many of time .
not uncommon at all.
The idea is the water will flow better being a full 4" curve .
I will be out on the water in two weeks .
The boat the had the fire was also changed and his boat was actually water tested with good results .
Cobra took care of his boat and looks very nice .The guys down there are good people.

Hope this is the fix . Time will tell .

Ok thx I thought someone had a straight thru the transom exhaust and some one else had a silent choice app. Straight thru exhaust would not apply here - correct me if I am wrong and of course this could come into play if there was angles needed in the first install design that caused this problem.