holley 1850-2 2101 Pump Discharge Needle Valve or check ball and weight.

Discussion in 'Engine Topic' started by bigblock665, Apr 19, 2011.

  1. bigblock665

    bigblock665 Veteran Member

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    Well im almost done with my initial tuning.. Before I install my discharge nozzle, does anybody know what is supposed to be under my nozzle? I have just a needle valve and not a check ball and weight... Is this correct for this carb?
    I have the ball and bail style (not umbrella) check valve under my accelerator pump diaphragm.

    Holley web shows my needle valve but also shows the ball and weight style for the "mid 70's and earlier" How do I find out what year my carb is?

    List: 1850-2
    2101
     
  2. COPO

    COPO Veteran Member Lifetime Gold Member

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    Holley didn't start using the 4-digit date code format until 1973.

    2101
    210=julian date-july
    1=year, which is 1981-1991 years

    All Holleys I've worked on were like
    [​IMG]

    http://www.nastyz28.com/~copo/holley.htm
     
  3. dubs74camaro

    dubs74camaro Veteran Member

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    After '73 Holley did go to the 4 digit dating with the first 3 numbers being the day out of 365 it was made and the last one being the year of a particular decade (1981, 1991, 2001...etc). The question that always follows is "what decade would mine be?"

    I will take for example the great 750 double pumper list 4779. It first appeared in the late 60's and only used the list number of 4779. Like with all carbs, as Holley would make changes to a particular cfm, they would also change the list number by adding a dash and a 5th number to indicate a revision. The changes could be just in appearance, they could be in metering or linkage styles too. Examples would be 4779-2, 4779-3, 4779-5 and so one.

    Given the fact that your 600 is an 1850-2, I'm almost certain that it is a 1981 carb. Most of the 1850s prior to that were factory carbs and had no dash after them. I ran 2 1850s on a tunnel ram in 1986 and they were both -2s. Hope this helps.

    Dub
    HP Carburetors
     
  4. bigblock665

    bigblock665 Veteran Member

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    thanx gentlemen then my needle valve is correct! installing the carb tomorrow!!!!:cool:
     
  5. COPO

    COPO Veteran Member Lifetime Gold Member

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    Don't forget about the top and bottom paper gaskets.

    [​IMG]

    [​IMG]
     
  6. bigblock665

    bigblock665 Veteran Member

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