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Hot Rods Engine angle help needed Gmc 302

Discussion in 'The Hokey Ass Message Board' started by flying53gmc, May 5, 2019.

  1. flying53gmc
    Joined: Mar 2, 2005
    Posts: 386

    flying53gmc
    Member
    from M-boro, TN

    Im finally back to work on my model A coupe with a Gmc straight six after about 7 years off. Since the original setup I have changed intake/ carb setup. When I originally set it up I had a 2 carb Nicson intake and mounted the engine by placing a level on the carb mounting surface. I have since put in a highly built 302 with a 4 barrel intake. This 4 barrel intake has a highly angled mounting surface. Do I have to try to re do my mounts to get this new carb level?? It’s gonna mess up a bunch with how tight all my clearances are. Please advise.
     

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  2. The only time that your fuel in your bowls knows that that carburetor is level is when you're sitting still. But I'm just thinking out loud.
     
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  3. oldiron 440
    Joined: Dec 12, 2018
    Posts: 3,299

    oldiron 440
    Member

    I don't use the carb mount to level the engine, I use the crank center line. I try for 3 to 4° nose up from level of the frame datum line. I don't remember what publication I gained this from but it's how I've been doing it for 40 years.
     
    Last edited: May 5, 2019
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  4. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,355

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    Carb being level on level ground at ride height is a good thing to shoot for. Otherwise the carb operates mostly off kilter, but then it’s only less or more level when actually on a hill. That is not something to strive for.

    Is it feasible for you to have the 4 bbl manifold milled to reduce the carb angle to match your dual carb manifold? That would be what I would look at were I in your shoes. 302 Jimmy....yum, yum!
     
    Last edited: May 5, 2019

  5. mohead1
    Joined: Jan 18, 2013
    Posts: 599

    mohead1
    Member

    Carb is angled so when suspension is extended under accel it will be close to level then, at speed....

    Sent from my SM-G900V using Tapatalk
     
  6. jaw22w
    Joined: Mar 2, 2013
    Posts: 1,671

    jaw22w
    Member
    from Indiana

    How do you go up or down a hill if the carb has to be level? How far off is the angle? A few degrees won't make much difference. The problem with milling the manifold is you then have to fill and re-drill the carb mounting holes perpendicular to the new surface.
     
  7. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,861

    Mr48chev
    ALLIANCE MEMBER

    I've always set the with the carb mount surface level. All the bullshit aside, that is how it sits when you tune it in the garage including setting float level and worrying about how it sits for a few seconds under acceleration or on a steep grade is nonsense thinking unless it is a drag only rig or a hill climb only rig.
    Ideal float level while being tuned in the shop is going to take in hill and acceleration conditions as it isn't going to accelerate hard enough to uncover the jets nor is it going to be on a grade steep enough to uncover the jets.
     
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  8. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,355

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    No, for that few degrees, you really don’t have to worry about the studs. But if you are super anal retentive and you must have them perfectly perpendicular, put nuts on the studs and whack ‘em with a hammer until they are. :D

    One thing about the HAMB, no matter what the physics, or the proven principle that is offered as a guide, as sure as day follows night, some member(s) will argue with known facts. “.......I’ve totally ignored (fill in the blank) ands it’s always worked for me!”........:cool:
     
    Last edited: May 5, 2019
    Ned Ludd, firstinsteele and F&J like this.
  9. jaw22w
    Joined: Mar 2, 2013
    Posts: 1,671

    jaw22w
    Member
    from Indiana

    :)
    LOL! I must be super duper anal retentive then. I couldn't live with it .
     
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  10. jimmy six
    Joined: Mar 21, 2006
    Posts: 14,802

    jimmy six
    ALLIANCE MEMBER

    Maybe it won't work for you but the first thing I would do is turn the 4 barrel 90 degrees....way more efficient. If you want I'll photo my linkage which I made using parts from Kinsler Injection catalog and its cable actuated.
    Not what you want to hear but that intake is really restrictive.
     
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  11. F&J
    Joined: Apr 5, 2007
    Posts: 13,222

    F&J
    Member

    There also used to be thin angle plates for 4 barrel carbs, maybe by Offy? Those just slipped over the existing studs.
    x2, and the hammer is ok, too.
     
  12. David Chandler
    Joined: Jan 27, 2007
    Posts: 1,101

    David Chandler
    Member

    Carb wedging plates used to be sold for marine engines. They may still be available? If not, add a spacer, and get it milled, if you can't live with it. You can play around with things on a spacer and not screw up the intake. That might be one thing to consider, if you ever want to use it elsewhere.
     

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