Manifold Quality

Mopar Exhaust Systems

  1. Shamu70

    Shamu70 Member

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    Has anyone had a problem with Year One exhaust manifolds cracking? My passenger side (mechanic says) is "probably cracked" due to it being a 493 & heat riser not open all the way ( due to a smaller diameter headpipe ). It's only 5 years old.
     
  2. Xenon

    Xenon Senior Member

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    What kind of manifold gasket are you using?
     
  3. Shamu70

    Shamu70 Member

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    The Fel Pro metal I think.
     
  4. Shamu70

    Shamu70 Member

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    Would a mechanics stethoscope work in this situation?
     
  5. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    That's probably the problem.

    The factory didn't use gaskets. I've never seen a gasket that didn't eventually blow out.
     
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  6. Shamu70

    Shamu70 Member

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    :wtf:........and here I have a new one coming. Shoulda checked that first.
     
  7. Xenon

    Xenon Senior Member

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    Annnddd as BJohn says..
    Almost every time there is an exhaust manifold problem
    it can be traced back to gasket use....
    QUIT TRYING TO FIX A PROBLEM THAT DOES NOT EXSIST..... :rolleyes::rolleyes:
     
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  8. CBODY67

    CBODY67 Old Man with a Hat

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    IF the factory exh manifold bolts are not used, sometimes the desire to cinch-down the manfold to the cyl head makes things a bit too solid. End result, as the manifold heats and cools, the metal expands and then contracts. IF the torque is too great on the bolts and/or they have no flat washer ("heat washer") under the bolt head, the manifold can't move under the bolt head, resulting in a crack over time. If the engine is run hard a good bit, building more heat in the exhaust, it can happen sooner than later, by observation. At least that's what we saw on Chevy 454s, especially after the locking tabs and heat washers went somewhere!

    Enjoy!
    CBODY67