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Technical Carb 2 use?

Discussion in 'The Hokey Ass Message Board' started by dtwbcs, May 6, 2017.

  1. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

    58gmc 1/2ton truck with 302gmc 6cylinder , Clifford Intake, Clifford Headers, HEI ignition, camwork, 3speed with manual OD
    Langdon suggested a holley390 or 4barrel Edelbrock 1406
    12bolt has a modified 4barrel Holley turned into a 3barrel;good results he claims.
    Just going to cruise around occasional hauling.

    Still cant decide...
     
  2. jeffd1988
    Joined: Apr 12, 2016
    Posts: 537

    jeffd1988

    If you have both on hand just give them both a try. But if your purchasing. Put a Edelbrock for Easyer tuning and jetting.

    Sent from my Z981 using The H.A.M.B. mobile app
     
  3. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

    I have it narrowed to either that modified Holley from 12bolt or the Edelbrock.
    No I don't have any carb on hand
     
  4. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

    So what is/are the differences in the holley390 and 12bot's modified 3barrel setup?I am confused about the two. Tom at 12bolt stated his runs on a single barrel until you push the pedal.;more efficient. Whereas the 390 is running on the idle circuit?o_O
     

  5. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

    Anybody using the modified Holley from 12bolt ?
     
  6. jazz1
    Joined: Apr 30, 2011
    Posts: 1,482

    jazz1
    Member

    I have a Edelbrock Thunder Series 500 on a smaller GM 4.3 V6. Works excellent right out of the box
     
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  7. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,953

    gas pumper
    Member

    I run a 500 cfm 1850 single feed Holley on our race 302 and ran it on our stock one too. It was cheap and easy. We ran it as a vac secondary for awhile and now it's mechanical. I don't really see a difference. The driveability is great and tuning simple.
     
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  8. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

  9. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,115

    jimmy six
    Member

    What a great idea. Will take some tuning as he says. I wonder why he wouldn't use 4th gear in his 5 speed? If is an overdrive, the last rear gear I would ever want is a 2.56.
     
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  10. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

    I went with the modified 3barrel Holley from Tom Lowe-12bolt
     
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  11. tubman
    Joined: May 16, 2007
    Posts: 5,205

    tubman
    ALLIANCE MEMBER

    That's different. I'd really like to see the manifold he is using. It looks like this is a 6 cylinder thing only; I don't see how it could work on a V8.
     
  12. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

  13. tlowe
    Joined: Oct 22, 2006
    Posts: 157

    tlowe
    Member

    The 3 BBL modified holley works great.
    One tuning tip. Use 2 springs in the secondary. I use the lightest one and one step down from the stiffest.
     
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  14. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,115

    jimmy six
    Member

    Real Holley 3 barrels were 1050's might be a tad over carbed for a 302. I've been 171 at Bonneville with a 600.
     
  15. dtwbcs
    Joined: Nov 15, 2011
    Posts: 841

    dtwbcs
    ALLIANCE MEMBER
    from Brenham,TX

    "tad over carbed"
    go to 12bolt and watch his video about how he modifies the 4barrel to make it a 3barrel.For a cruiser it will do fine(for me)--
     
  16. jimmy six
    Joined: Mar 21, 2006
    Posts: 7,115

    jimmy six
    Member

    Thanks, I have seen his video and forgot about his conversion. It's really a good idea since most 6's came with a single barrel and would continue to perform well as you say by crusing. Opening one up using all barrels of his carb conversion would happen during acceleration and a GMC can handle that well even with very little hop-ups. My reference was to the real Holley 3 barrels that performed extremely well an large engines.
     
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