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Thread: 67 DeVille 429 Exhaust Manifold Gaskets

  1. #1
    Join Date
    Aug 2004
    Posts
    1

    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
    Join Date
    Mar 2005
    Posts
    1

    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
    Join Date
    Sep 2004
    Posts
    266

    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): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003
    Location
    california
    Age
    69
    Posts
    6,688

    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
    Join Date
    Nov 2003
    Location
    DETROIT
    Age
    47
    Posts
    7

    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
    Join Date
    Jul 2006
    Location
    Missouri
    Posts
    5

    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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