67 DeVille 429 Exhaust Manifold Gaskets
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Other Cadillac Engines Discussion, 67 DeVille 429 Exhaust Manifold Gaskets in Cadillac Engine Technical Discussion; Car runs great but I can't get the (factory spec) exh manifold gaskets to last more than about 5k miles. ...
  1. #1
    Georgia Johnny is offline Cadillac Owners Member
    Join Date
    Aug 2004
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    Cool 67 DeVille 429 Exhaust Manifold Gaskets

    Car runs great but I can't get the (factory spec) exh manifold gaskets to last more than about 5k miles. Can't seem to locate any "tougher / header-type"
    gaskets that'll fit. Don't mind spending a few extra $$ on copper or aluminum gaskets - anyone know who or how such a set could be "custom made" ?

    All other advice also welcomed. Thanx, GaJ

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  3. #2
    zolaray25 is offline Cadillac Owners Member
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    Mar 2005
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    Re: 67 DeVille 429 Exhaust Manifold Gaskets

    I have the exact same problem with my 1970 DeVille 472 engine. Please , if you locate any heavy duty gaskets please email me the info zolaray25@hotmail.com Thanks, George

  4. #3
    haymaker is offline Cadillac Owners Fanatic
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    Re: 67 DeVille 429 Exhaust Manifold Gaskets

    Have you tried stacking two new oem exhaust gaskets together? Your exhaust manifolds may have warped from the heat over the years. Two gaskets stacked together would help fill any voids. You may also want to clean and torque the exhaust manifold bolts to 35 lb/ft during installation.

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: 67 DeVille 429 Exhaust Manifold Gaskets

    My thought is the manifold is warped. Pull it off and verify with a straight edge or have a machine shop do it for you.

  6. #5
    bigpipesvalk's Avatar
    bigpipesvalk is offline Cadillac Owners Member
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    Nov 2003
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    Re: 67 DeVille 429 Exhaust Manifold Gaskets

    I had same issue with my 429 ci, I had the heads decked, and talked my buddy into "decking" the manifolids. Never had a nother problem after that.

  7. #6
    LBF
    LBF is offline Cadillac Owners Member
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    Jul 2006
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    Missouri
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    Re: 67 DeVille 429 Exhaust Manifold Gaskets

    My '73 Cadillac had a cracked exhaust manifold. I found a replacement set, and after having them machined straight I painted them with Eastwood exhaust paint and had them installed w/o any gaskets, at the "suggestion" of my mechanic. No leaks yet. Question - did you have the bolts retorqued after a couple hundred miles?

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