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  1. #1
    Join Date
    Dec 2009

    cooling crossover

    Does a crossover instead of a circulating pump really give you more hp? What effect does it have on the cooling of the engine if any? This will be on a whippled 454 mag. Thanks..Winkman

  2. #2
    My Boats:
    1967 34 Hatteras summer house. 2000 Crownline 248ccr her boat. 79 Pantera 24 Sport.
    Join Date
    Feb 2012
    westville, NJ
    it doesn't give more. just uses less, so more is left over for the prop. many people have mentioned overheat issues and higher temp in back of engine issues. usually have to drill out rear water passage cover on back of intake and plumb water outlets there. i don't think many people recommend it as a way to save 10 or so hp.

  3. #3
    My Boats:
    1998 Velocity 280
    Join Date
    Oct 2010
    Cheboygan, MI
    You need to do a search, there are a ton of discussions over this topic. If you have a good seawater pump with good flow through your block, you will see virtually no difference with a crossover verses a circulation pump. Provided you are using a crossover with a bypass. I am using a crossover and I measure my water temps at the front and back of my heads and there is about 5 degrees difference. I would recommend using a crossover that has an offset on the inlet, mine is centered and the right bank runs about 10 to 15 degrees cooler than the left.

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