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  1. #1

    Default Can anyone help with a 454 mercruiser

    I have a 454 mercruiser and the boat was not winterized and it was started with the hose attachment and 2 freeze plugs popped out, so i replaced the freeze plugs and now there is water in the oil. does anyone think it is a head gasket, cracked head, or a cracked block. What is the best way to tell what damage is done? Is there a chance the block is fine and the exhaust manifold is where my problem is?

  2. #2
    Join Date
    Jun 2006
    Spotswood, NJ, USA

    Default Re: Can anyone help with a 454 mercruiser

    just remove the manifolds and test them .Manifolds if bad would at east foul a cylinder with water. Water that fast in a block is usally a cracked block
    You can also remove the manifold and check the valley for cracks

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