Where can I find exhaust for a 440??

Discussion in 'Inboards' started by mongo75, Aug 9, 2007.

  1. mongo75
    Joined: Aug 2007
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    Location: Orange County California

    mongo75 Senior Member

    Or am I mistaken- can I run freshwater through the manifold, with a solid gasket through the riser? I can swear I've seen that before....
     
  2. USCGRET/E8
    Joined: Jul 2007
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    USCGRET/E8 Senior Chief

    Those aluminum headers are not pure aluminum. They are a high quality marine alloy and will not deteriorate like the steel ones. Therefore no need for coating the inards.
     
  3. USCGRET/E8
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    USCGRET/E8 Senior Chief


    I don't think It will work. The water needs to continue on out the exhaust to keep those hoses and pipes cool.
     
  4. Jango
    Joined: Aug 2005
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    Jango Senior Enthusiast

    I'm strickly a Fresh Water Boater, but see no reason why circulating Fresh water thru the Manifolds and "dumping" sea water at the Risers would'nt work.
    Early Mercruisers worked this way, with fresh water only, (3 hoses) to pre- heat Engine water.
    You might need "extra" capacity in the heat exchanger.
     
  5. USCGRET/E8
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    USCGRET/E8 Senior Chief


    I think that set up would require especially designed headers.
     
  6. schooner
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    schooner New Member

    Try hitting some of the local swap meets in your area lots of good deals on used.
     

  7. mongo75
    Joined: Aug 2007
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    Location: Orange County California

    mongo75 Senior Member

    The reason I though about running a fresh water system vice raw water is because I have a heat exchanger laying around from an old junker I aquired. That boat had a 350 in it, so I'm guessing that it would be big enough for a 440?? In my last two boats, it's always been raw water. I might just stay with that as it's definitely a simpler set up. Is it worth it though to run a FWC block? I always rinse my engine out right after it come out of the ocean. Thanks everyone for the advice!
     
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