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Technical Edelbrock B 20 manifold for Pontiac V8

Discussion in 'The Hokey Ass Message Board' started by '51 Norm, Mar 28, 2024.

  1. '51 Norm
    Joined: Dec 6, 2010
    Posts: 873

    '51 Norm
    Member
    from colorado

    After a 6+ year search I finally found a 671 supercharger intake manifold for a Pontiac V8. Now I am searching for information on it. And yes I tried the search function but the information that I found was old and sp****.
    When searching on Edelbrock's web site all I found was information on a Datsun manifold, I guess that Edelbrock has no information on items that are out of production.
    Apparently, when the manifold was made it didn't have provision for coolant p***ages or thermostat housing. My manifold has been modified with pipe threads at the coolant outlets on the heads so that hoses and a remote thermostat can be installed. Is this acceptable from a cooling standpoint?
    Soooo, has anyone else messed with one of these? What are other pitfalls that I haven't discovered yet?
    I am afraid that the drive pulleys etc. are going to get interesting.
    I have a '51 GMC that is the intended recipient for this engine. I discovered some time ago that there was room under the hood for a blower thus saving me the trouble of cutting a hole in the hood. Sorry, that is the best excuse that I could come up with.
     
  2. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 3,348

    wheeltramp brian
    Member

    Do you have a picture of that intake? Would be nice to see.
     
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  3. 67drake
    Joined: Aug 8, 2008
    Posts: 816

    67drake
    Member
    from Muscoda WI

    Norm. I sent you a message.
     
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  4. Fordors
    Joined: Sep 22, 2016
    Posts: 6,520

    Fordors
    Member

    I think you will find that your cooling system operates just as well as a Pontiac having the factory thermostat location. For my 350 SBC with an early Weiand blower manifold I tapped the front of the heads for 3/8 NPT and used -8 AN fittings and hose to an Offenhauser divorced thermostat housing.
     
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  5. '51 Norm
    Joined: Dec 6, 2010
    Posts: 873

    '51 Norm
    Member
    from colorado

    I will get some pictures when I drag the camera to the garage, likely tomorrow.
     
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  6. '51 Norm
    Joined: Dec 6, 2010
    Posts: 873

    '51 Norm
    Member
    from colorado

    Thanks for the information, that is just the sort of thing that I am looking for.
    The manifold is tapped for half inch NPT so that should get the job done.
     
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  7. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 3,348

    wheeltramp brian
    Member

    The reason I was asking for a picture was that I was trying to buy one about a year ago. It was to mount a 671 blower And I couldn't remember what brand it was.
     
  8. '51 Norm
    Joined: Dec 6, 2010
    Posts: 873

    '51 Norm
    Member
    from colorado

    This manifold is for a 671 blower onto the early Pontiac heads and so will need to be modified to fit the later ones. Since I need to have a couple of cracks welded up (see pictures) I will do the modifications at that time.

    This manifold isn't in perfect shape but considering how long I have been searching for any Pontiac blower manifold I am thrilled to have it.
     

    Attached Files:

    lemondana and Deuces like this.
  9. flamedabone
    Joined: Aug 3, 2001
    Posts: 5,759

    flamedabone
    ALLIANCE MEMBER

  10. '51 Norm
    Joined: Dec 6, 2010
    Posts: 873

    '51 Norm
    Member
    from colorado

    I'm afraid that I am going to be in trouble finding all of the other pieces. It wouldn't surprise me at all if I have to fabricate some of them.
     
  11. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 3,348

    wheeltramp brian
    Member

    Really cool man. Thanks for the pictures.
     

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