98' GT bbk h-pipe w/stock manifold exhaust leak

Discussion in 'Exhausts' started by amf201091, Apr 28, 2020.

  1. amf201091

    amf201091 New Member

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    The previous owner installed a bbk h-pipe from AmericanMuscle and kept the stock manifold. The car has an exhaust leak where the manifold meets the h-pipe on the passenger side. I took it to an exhaust shop and the owner told me that I would either need to find a gasket that's thicker and better quality than OEM (option A) or (option b) get some headers. AmericanMuscle says that the BBK h-pipe is meant to go with bbk long tubes and I'm guessing this is why... Does anyone know where I can find a thicker/better quality gasket that would go in between the manifold and the h-pipe?
     
    Last edited: Apr 28, 2020
  2. delling3

    delling3 Active Member

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    BBK makes two different H pipes - one for the stock manifold or shorty headers, and one for long tubes. If the pipe you have will even remotely come close to bolting up to the stock manifold, you have the right H-pipe.

    My understanding is that installing long-tube headers requires you to lift the engine off it's mounts, or drop the front K-member for clearance. Not sure if it possible, but likely you could install shorty headers without this, but I am not sure that they would do you any good.
     
  3. amf201091

    amf201091 New Member

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    Yeah, I just noticed it's not the same one that is currently offered on AmericanMuscle. The one I have is meant to be a direct replacement of the factory mid-pipe. I'm thinking of just ordering a OE gasket off AmericanMuscle and hoping that fixes the leak.
     
  4. 96blak54

    96blak54 Legend

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    The bolts probably stretched out some. They do experience tons of heat and any tension is gonna allow them to stretch out into nominal unclamping state.

    Maybe a new gasket and bolts
     
  5. joe65

    joe65 Active Member

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    you could buy gasket material and make one?
     
  6. ttocs

    ttocs Post Whore

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    I am gonna need pics to see how they have h pipe for long tubes hooked up to the stock manifold.
     
  7. 96blak54

    96blak54 Legend

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    One side is like a ball socket mount, the other side is a crush gasket. Ill try to get a pic
     
  8. 96blak54

    96blak54 Legend

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    Manifold and hpipe both mate together with a special crush gasket. Replace this gasket. Should be good 20200428_172152.jpg
     
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  9. 96blak54

    96blak54 Legend

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    Also, you may get lucky and just tighten it up
     
  10. ttocs

    ttocs Post Whore

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    I am still confused on how a mid pipe made for long tubes could ever fit a stock manifold and not because of the connection. I thought long tubes came down a bit further than shorties, and the mid pipe was shorter because of this?
     
  11. joe65

    joe65 Active Member

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    they do (longtubes), it has to be a standard full h pipe. The only other option is custom cut and weld.
     
  12. amf201091

    amf201091 New Member

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    It's just a bbk h-pipe thats a direct replacement of stock mid-pipe
     
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  13. amf201091

    amf201091 New Member

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  14. RAU03MACH

    RAU03MACH Well-Known Member

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  15. RAU03MACH

    RAU03MACH Well-Known Member

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    I ended up putting 2 of those on the passenger side of my cobra
    Not sure about the gap between I did blow one out on the passenger side
     
  16. RAU03MACH

    RAU03MACH Well-Known Member

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    Now I remember why I put 2 in there was a little bit of a gap in between the jba shorty header and the bbk flange
    The header manufacturer or bbk to short
    That's why I put 2 of them in and tighten the shit out of it
     
  17. ttocs

    ttocs Post Whore

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    Would it help to take the back connection to the pipe off or at the least loosen it, tighten the front and then go to the back?
     
  18. RAU03MACH

    RAU03MACH Well-Known Member

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    No because the driver side bbk h pipe was slightly longer on driver side
    And made it look like the jba header shorter on the passenger side just a manufacturer defect in one ore the other I closed the gap up on passenger side I put 2 gaskets it worked you would think everything is to a t
    Fit
    The quality on parts have been in the shitter for a while
     
  19. amf201091

    amf201091 New Member

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    So you think if I put two of these https://www.americanmuscle.com/ford-manifold-to-midpipe-gasket-rh-9604.html on it would fix the leak?
     
  20. Jakespeeds

    Jakespeeds Member

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