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jet size for twin 94's on a flattie ?

Discussion in 'The Hokey Ass Message Board' started by wobbly A, Aug 24, 2013.

  1. wobbly A
    Joined: Mar 14, 2013
    Posts: 10

    wobbly A

    Am setting up 2 94's on an early weiand for my 81a in the '40, and would like to know what jet sizes others with similar set up are running.
    Both carbs will operate together, engine is good healthy one that is basically stock. Headers, twin system and a very mild cam .

    thanks in advance....
  2. mastergun1980
    Joined: Oct 18, 2010
    Posts: 1,095

    from Alva OK

    2 94's are really to much for a 81a unless it's built really hot - My 81a has a pair of Stromberg 81's it runs really well with stock ( 35 I think ) jet size. I'm not much help...
  3. Jack E/NJ
    Joined: Mar 5, 2011
    Posts: 678

    Jack E/NJ
    from NJ

  4. Jet size is important but also the power valves need to be changed too because with two carbs the vacuum will be less.

  5. 42merc
    Joined: Dec 19, 2010
    Posts: 786


    Do a search on the HAMB, Holley tech, 94 info, ect. Much info out there, some good, some not so good.
  6. 1952henry
    Joined: Jan 8, 2006
    Posts: 894


    4.5 power valves and .049 jets will get you in the ballpark.
  7. wobbly A
    Joined: Mar 14, 2013
    Posts: 10

    wobbly A

  8. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 3,156

    Kiwi 4d

    We are running 46 mains on twin carb 276 strong flatty with a mild cam that was blown at one stage. Also run 43 mains on a twin carb 260 motor mild but BIG cam and on this could possibly sneak a smaller main but with the BIG cam it tends to snatch at low rpm in a tall gear though on the open road it just wants to keep going. At least in NZ we don't have to worry about altitude.
  9. 38 Ford Guy
    Joined: May 18, 2008
    Posts: 76

    38 Ford Guy

    I am running 49 jets in both carbs and 2.5 power valves in each carb. Gets good mileage with plenty of power. In higher altitudes I need to plug one power valve otherwise too much fuel.

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