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Thread: 1957 364 with very strange problem

  1. #1
    Join Date
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    1957 364 with very strange problem

    We have a 1957 364 nail head bored to 401. The engine has 300 miles on it. The engine runs great until the temp gets to 180 plus degrees. Then the engine blows raw oil out the exhaust at a tremendous rate. Still runs good but oil runs out the tailpipe. What is the cause? None of the plugs foil or show any oil. Number 2 cylinder shows oil dripping from the exhaust manifold. Help!!

  2. #2
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    To be clear, there is not smoke coming out of the exhaust? that means the oil isn't being burned, so I would start by looking for a misfire.
    are there any other symptoms like loss of power or rough running at any time? What kind of PCV system do you have?


    when you say oil is dripping from the exhaust manifold on #2, you mean at the exhaust manifold gasket between head and manifold? yet the plug is not fouled? is there an audible exhaust leak when it's running, from this port?


    I would check to see if the exhaust manifold is hot right at the #2 exhaust port. use one of those laser thermometers and check the temp of every exhaust port as its running. There has to be a misfire somewhere if the oil isn't being burned.


    Oil can only get into your exhaust from past the rings, past the valve stem seals, a faulty head gasket, through the intake manifold via PCV or other issue, or a crack in a cylinder head.

    Also, is the exhaust heat riser valve working properly on the manifold?

  3. #3
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    Found the problem. The head on left side is cracked. The crack is between the exhaust port and the oil feed galley in the head by the number two cylinder. As the head warmed up, the crack opened to push oil directly into the exhaust manifold.

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