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original Cobra Hi-Rise intake leaking oil

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by zrayr, Mar 30, 2009.

  1. Mar 30, 2009 #1
    zrayr

    zrayr Well-Known Member

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    Anyone having (or has had) issues with their original Cobra Hi-Rise intake having cracks or porosity resulting in oil being pulled into the intake runners?

    I have oil inside the intake. I first though it was all coming thru the PCV plumbing, but now am leaning toward the idea that the intake has cracks or porosity allowing the oil to pass thru it.

    Anyone run into this one?


    Z. Ray
     
    zrayr, Mar 30, 2009
    zrayr, Mar 30, 2009
    #1
  2. Mar 30, 2009 #2
    Doug_GT350

    Doug_GT350 Well-Known Member

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    What about the possibilty of the intake gasket leaking? Just a thought, I always like to start with the simple things first.
     
    Doug_GT350, Mar 30, 2009
    Doug_GT350, Mar 30, 2009
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  3. Mar 30, 2009 #3
    zrayr

    zrayr Well-Known Member

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    I replaced the intake gaskets, but the old ones didn't appear to have been leaking.

    Z. Ray
     
    zrayr, Mar 30, 2009
    zrayr, Mar 30, 2009
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  4. Mar 30, 2009 #4
    thefordshow

    thefordshow Well-Known Member

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    Yes,..I pulled the spark plugs to see if it was isolated. Found out it was a small hole from the underside of the intake leaking into one of the center ports.
     
    thefordshow, Mar 30, 2009
    thefordshow, Mar 30, 2009
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  5. Mar 31, 2009 #5
    Doug_GT350

    Doug_GT350 Well-Known Member

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    Great minds think alike!!!! anyway sounds like "thefordshow" has had the same problem......... good luck
     
    Doug_GT350, Mar 31, 2009
    Doug_GT350, Mar 31, 2009
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  6. Mar 31, 2009 #6
    highland green

    highland green Well-Known Member

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    yes, I bought a small block intake through Ford parts back in the early 70s. It leaked. Changed gaskets, still leaked. My Dad came along and examined the intake in the sunlite and found a crack just under the carb in the plenum.
     
    highland green, Mar 31, 2009
    highland green, Mar 31, 2009
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  7. Apr 1, 2009 #7
    zrayr

    zrayr Well-Known Member

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    that's where I think mine has a crack. I can see one under the carb area, but don't know if it's superficial, or goes all the way through the casting. I'm going to thoroughly investigate the other "easy" fixes ( over oiling via the pvc plumbing) before I take the intake off again.

    Z. Ray
     
    zrayr, Apr 1, 2009
    zrayr, Apr 1, 2009
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  8. Apr 1, 2009 #8
    highland green

    highland green Well-Known Member

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    sorry I cant help with the repair. Back then, I just returned it for another. Perhaps some JB weld? I also recall the intake would push out the front cork gasket. This was solved with silicone gaket maker.The intakes were buddy bar castings with Ford script , not Cobra. I also had a 351 alum intake on another car and recall that it fit much better.
     
    highland green, Apr 1, 2009
    highland green, Apr 1, 2009
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