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Technical Chevy intake 346250

Discussion in 'The Hokey Ass Message Board' started by 1959Buick, Jul 28, 2018.

  1. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    I have a question for the SB Chevy experts. Does anyone has a vacuum diagram for a intake manifold casting number 346250 and second question is there no EGR Valve?
    Thanks again for your help
     

    Attached Files:

  2. i see no place for an EGR valve. i also see mounting holes for a coil, so it's an early manifold...probably before the pollution stuff

    what do you mean by vacuum diagram? the only port i see that would have vacuum is that port on the rear intake runner right in front of the distributor hole
     
  3. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    Thank you. I thought in 1975 all cars had EGR and Vacuum lines.
     
    loudbang likes this.
  4. Deuces
    Joined: Nov 3, 2009
    Posts: 23,755

    Deuces

    You should be thankful that this intake don't have one!!!!!....... :rolleyes::)
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 55,942

    squirrel
    Member

    not all 350s went into cars, some went into trucks, and the emissions laws were more lax for them.
     
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  6. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
    ALLIANCE MEMBER

    Depending on year, the vacuum hoses went to the carburetor, and a fitting on the thermostat housing.
     
  7. bobscogin
    Joined: Feb 8, 2007
    Posts: 1,771

    bobscogin
    Member

    Could it be a marine manifold?

    Bob
     
  8. Moriarity
    Joined: Apr 11, 2001
    Posts: 30,778

    Moriarity
    SUPER MODERATOR
    Staff Member






    the fact that it has the bosses to mount an ignition coil makes it 74 or older. 1975 was electronic ignition
     
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  9. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
    ALLIANCE MEMBER

    Good catch.
     
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  10. squirrel
    Joined: Sep 23, 2004
    Posts: 55,942

    squirrel
    Member

    also they quit using the coil type choke gizmo some time in the early/mid 70s.
     
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  11. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    It came off a 75 Chevy truck. Off cause the intake could be swap some time
     
  12. greybeard360
    Joined: Feb 28, 2008
    Posts: 2,074

    greybeard360
    Member

    Info I found said it was a 76-82 305/350 intake. It may be that the casting number was carried over to the later engines and the egr part was added to the casting. We all know GM was bad about using the same block casting numbers thru different variations. I would say that intake is 74 and earlier because of the divorced choke and is non egr.
     
  13. XXL__
    Joined: Dec 28, 2009
    Posts: 2,117

    XXL__
    Member

    OP is in Canada. Might Chevy have been building a few parts bin trucks as late as '75?
     
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  14. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    Thanks for your answers. So is it a good intake or should I look for a late 70's early 80's intake. I do not need more power. I only want to change my 2 barrel carb into a 4 barrel Carb ( came of a 83 Monte Carlo ) I have a 283 Chevy original Chevy engine.
    Thanks again
     
  15. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    Yes it is funny what GM did. In Europe you could by big Opel cars with brand new 327 engines up to the 80's
     

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  16. squirrel
    Joined: Sep 23, 2004
    Posts: 55,942

    squirrel
    Member

    without knowing more about the engine, vehicle, etc, it's hard to make a recommendation..but for a stockish 350 with a Qjet on it, that's a decent intake. Probably the best one to recommend, if you're shopping for $5 intake manifolds.
     
  17. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

     
  18. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    Hi Jim
    I have an original 1959 Bel Air 283 engine 350 TH transmission. I will not use the car for racing or so.. Just like to have an nice running with easy to get parts in Canada, So I bought a TH350 , a Qjet Carb and I will use a canister ( fuel tank vent ) to stop the gas smell in the garage. I did it on my Buick, works great. I could buy the intake from a 83 Chevy Monte Carlo for $25.00 it it's a better one.
     
  19. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
    ALLIANCE MEMBER

    For a dollar-down build, that intake, and a good Quadrajet will work fine, so long as you address the 283's crankcase venting.

    Later SBC's lost the fill/breather that the early SBC's had.
     
  20. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    And exactly this is what I like to get rid off , the old crankcase venting
     
  21. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,264

    gimpyshotrods
    ALLIANCE MEMBER

    Well, the fill goes away with the manifold.

    You can take out the baffle below the manifold, and then put a core plug in the road draft tube hole.

    You will need to have another form of venting, or a conventional PCV setup.
     
  22. squirrel
    Joined: Sep 23, 2004
    Posts: 55,942

    squirrel
    Member

    put some later model valve covers (with PCV and breather holes) on it, and you'll solve that problem. It just won't look like a 283 any more
     
  23. Speed Gems
    Joined: Jul 17, 2012
    Posts: 6,433

    Speed Gems
    Member

    Pull the intake off and put it on Ebay , Roundy Round track racers like them because they are non EGR, What is the casting number on the '83 Monte intake? That maybe a good one too.
     
  24. 1959Buick
    Joined: Sep 14, 2013
    Posts: 122

    1959Buick
    Member
    from BC Canada

    I belief it was 340281 not 100% sure.
     

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