Header Leak??

Discussion in 'Fox 5.0 Mustang Tech' started by smkshw, Mar 22, 2014.


  1. smkshw

    smkshw Active Member

    Joined:
    Feb 12, 2010
    Messages:
    448
    Likes Received:
    59
    Trophy Points:
    39
    ceramic....
    #21
  2. Gearbanger 101

    Gearbanger 101 we love us some gays up here Super Mod

    Joined:
    Aug 11, 2002
    Messages:
    14,103
    Likes Received:
    807
    Trophy Points:
    164
    Then I doubt they were overheated and warped the flange. Most coatings are good for at least 1,200F. If they got hot enough to warp the flange, the coating would have been burned and turned chalk white nearest it and for the first few inches or so down the primary tubes. This is usually result of a timing issue....generally and engine running with the timing too far retarded.
    #22
  3. smkshw

    smkshw Active Member

    Joined:
    Feb 12, 2010
    Messages:
    448
    Likes Received:
    59
    Trophy Points:
    39
    it did it right from first start...so wouldnt be from being to hot anyway....im going to try the soak method first and go from there....
    #23
  4. 7upstang91

    7upstang91 Active Member

    Joined:
    May 30, 2008
    Messages:
    819
    Likes Received:
    35
    Trophy Points:
    29
    Every understandable, how ever that was my last resort with the BBK's on my mustang. First, I replaced the gasket with one of the Fel-Pro deals (paper), two months later the header gasket blew. The second time, I spent the money and bought the metal gasket, used the Copper spray and torqued the heads from the inside out with my torque wrench. From that point on, the gasket blew twice more using the method you previously stated. At this point in life I could replaced a header gasket in an hour. Needless to say, have the flange trued, paid the money for a proper gasket along with copper spray and torquing from the inside to out, I've yet to have a problem.

    Just speaking from personal experience, replacing the header gaskets four times is a pain. I would hate to have someone go down the same path I did. Like you stated, the BBK's are thick enough at the flange.

    If I were the OP I would try one time with the sequence Gearbanger 101 has stated. If that fails I would have the flange trued.
    #24
  5. Gearbanger 101

    Gearbanger 101 we love us some gays up here Super Mod

    Joined:
    Aug 11, 2002
    Messages:
    14,103
    Likes Received:
    807
    Trophy Points:
    164
    I used the high heat copper silicone in a tube, not the spray. I spread it around the ports with my finger to create the high spots specifically around them not all over the surface of the gasket.

    [​IMG]
    #25
  6. rbohm

    rbohm Founding Member

    Joined:
    Apr 13, 2002
    Messages:
    6,268
    Likes Received:
    250
    Trophy Points:
    104
    one more thing, before you reinstall the header, make sure the gasket surfaces are as clean as possible. this is the stuff i like to use;

    [​IMG]
    #26
  7. smkshw

    smkshw Active Member

    Joined:
    Feb 12, 2010
    Messages:
    448
    Likes Received:
    59
    Trophy Points:
    39
    i will do that thank you...hope it works this time!
    #27

Share This Page