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The 8.1's are a different block than the 454 7.4. It is also my understanding that my 380HP motors also utilize 502 Heads to gain the extra HP. All in all, I am hope to find some retrofit that allows the dry-joint system for the 7.4 380 HP blocks.

I would have also loved to switched from the standard mani./risers and gone to the dry Joint and also being told that they do not exist for the 7.4 454's. If anyone hears different, please advise. The original design from Merc should have triggered a class action law suit. The fact that riser...

Thanks for the suggestion Ron, I will look into fresh water cooling the manifolds on the rebuild. I also just heard about Stainless Steel gaskets? Which did not sound right to me. I found a great article from BOAT US - " BoatUS has received information about this problem from...

Thanks again guys. I have Boat US for insurance which isn't cheap and was initially encouraged that my motors were covered on my policy - yeah right. There seemingly only covered if you do somthing stupid like ride up on rocks or something. The surveyors report sided dissimilar manufacturers...

Thank you guys. This is a abomination. There should be a class action suit against Mercruiser. I know that I have what is referred to as "half fresh water cooled" so I do have salt running through the manifold/risers I am almost certain. I know it is not just a head job and the motor did...

I own a 1999 Sea Ray 370 Sundancer with twin 7.4 380 Hp MPI's that I purchased in Aug 2007. This boat is on its 3rd set of engines after the water ingestion problems due to the original exhaust design problem. I verified that the correct exhaust modification lift system was installed when the...