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Considering boat with twin 7.4L MPI Horizon engines. Wondering if any pros or cons with the closed cooling system such as more or less maintenance, more or less winterizing, better or worse mpg. Not familiar with this type of set up. With 380hp it seems rather powerful on a 33 footer. Thanks.
 

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That motor is NOT basically a 454. It is based on the old 454 MAG with 365h.p. They added multiport fuel injection, closed cooling and a couple other goodies. The horizon's also have a THREE year warranty not one year. I have two of them in my boat and they are awesome. Winterizing is a breeze. Pull a couple plugs here and there and done.
 
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