1966 421 HO Pontiac with Edlebrock Wet Exhaust Manifold
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1966 421 HO Pontiac with Edlebrock Wet Exhaust Manifold

  1. #1
    Junior Member Blue Mist's Avatar
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    Default 1966 421 HO Pontiac with Edlebrock Wet Exhaust Manifold

    In the process of rebuilding this engine i noticed that my left exhaust manifold has developed a 7 inch crack horizontal within the top accent recess of the aluminum manifold. This appears to be in just the outer jacket of the manifold but may not be repairable. I'm wondering if anyone knows of where a replacement manifold might be found; looking for any helpful suggestions.
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Name:	1966 421 HO Pontiac with Edelbrock M3 Exhaust Manafold 2.jpg 
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ID:	153034
    Last edited by Blue Mist; 03-18-2012 at 05:21 PM.

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    This guy might be able to help you out

    http://www.performanceboats.com/boat...e-project.html

    what kind of boat is your pontiac in any pics? Welcome aboard
    Last edited by daMoose; 03-18-2012 at 05:52 PM.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Blue Mist View Post
    In the process of rebuilding this engine i noticed that my left exhaust manifold has developed a 7 inch crack horizontal within the top accent recess of the aluminum manifold. This appears to be in just the outer jacket of the manifold but may not be repairable. I'm wondering if anyone knows of where a replacement manifold might be found; looking for any helpful suggestions.
    Click image for larger version. 

Name:	1966 421 HO Pontiac with Edelbrock M3 Exhaust Manafold 2.jpg 
Views:	124 
Size:	200.3 KB 
ID:	153034
    The crack visable on the outside can be easily repaired and likely will not even show its the possibilty of an internal crack that I would be concerned with , you may want to consider making a "test plate" to pressure test the manifolds while checking/repairing/testing Tom

    BTW Very cool Old Tri Power setup !

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    Senior Member EVILFORCE's Avatar
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    Now all you need is a old Rayson Craft to put it in.
    No Fool Like A Old Fool is there?

  7. #5
    AKA OhOneWS6 Last Mohican's Avatar
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    Cool to see another Pontiac in a boat. Hopefully you just have a crack in the outer wall and it can be repaired. I have seen two sets of Pontiac logs come up in the last 3 years. They are rare but they are out there.

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