Intake manifold
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500, 472, 425, 368 Discussion, Intake manifold in Cadillac Engine Technical Discussion; Anybody out there know of Boston area shop that could cut out the plenum for me on intake manifold. I ...
  1. #1
    cady75 is offline Cadillac Owners Member
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    Intake manifold

    Anybody out there know of Boston area shop that could cut out the plenum for me on intake manifold. I had new exhaust, with modern cat put on magnaflow so now I'm looking front more air in? also with larger opening can I put orignal carb directly on or do I need adaptor. I'm tempted to switch over to Edelbrock. Don't want to affect hood.

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  3. #2
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Intake manifold

    I'm not around Boston but any automotive machine shop should be able to do it.

  4. #3
    terrible one's Avatar
    terrible one is offline Banned
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    Re: Intake manifold

    Yeah, any machine shop should be able to do it. The original carb will fit directly in place. You aren't do;ing anything but cutting the plenum out. The carb pad will remain the same. You could also do it yourself if you have a bit of know-how and access to a die grinder.

  5. #4
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    davesdeville is offline Banned
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    Re: Intake manifold

    The center cut manifold modification will benefit with the addition of a 1" carb spacer as well. If you want to change carbs (I wouldn't, the QJet is IMO the best carb for a street car period) you can use a 1" spacer/square bore adaptor.

  6. #5
    74eldog is offline Cadillac Owners Fanatic
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    Re: Intake manifold

    Quote Originally Posted by terrible one
    Yeah, any machine shop should be able to do it. The original carb will fit directly in place. You aren't do;ing anything but cutting the plenum out. The carb pad will remain the same. You could also do it yourself if you have a bit of know-how and access to a die grinder.
    how many more horses can u get by doing this?

  7. #6
    davesdeville's Avatar
    davesdeville is offline Banned
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    Re: Intake manifold

    Never been dyno tested AFAIK. But the Edelbrock is apparently worth around 20hp, this flows almost as well - make your own conclusions.

  8. #7
    74eldog is offline Cadillac Owners Fanatic
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    Re: Intake manifold

    thanks bud

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