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Holley double pumper question

Discussion in 'The Hokey Ass Message Board' started by Automotive Stud, Oct 16, 2010.

  1. Automotive Stud
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    Automotive Stud Member

    I'm rebuilding a Holley 750 double pumper but I noticed the rear power valve is plugged. Should it have a rear power valve also or leave it plugged? It's going on a street 440 with a healthy cam. Thanks
  2. squirrel
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    squirrel Member

    no need for a power valve on the secondary side.
  3. Automotive Stud
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    Automotive Stud Member

    Cool thanks
  4. Deuces
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    Deuces Member

    What's the List number on the choke horn????
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  5. Automotive Stud
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    Automotive Stud Member

    It's 4779-6
  6. squirrel
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    squirrel Member

  7. Automotive Stud
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    Automotive Stud Member

  8. Deuces
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    Deuces Member

    Here's a pic of it......

    Attached Files:

  9. Deuces
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    Deuces Member

    The one pictured above shows that it has 4 corner idle mixture screws..... Does yours have that???
  10. Automotive Stud
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    Automotive Stud Member

    sure does
  11. Deuces
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    Deuces Member

    Being that this carb has the "down leg" venturie boosters, it's actualy a 780 cfm carb... If it had the straight boosters, it would flow around 750 cfm.....
  12. kaboom
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    kaboom Member

    There is no need for a power valve in the rear but if the front has a power valve then it will have different jet sizes. PM me if you have any more questions or need any parts. I work at a high performance carb shop and can get any holly part sent to you the same day.
  13. wildearp
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    tucson, az

    wildearp Member

    Holley has a decent tech line. They were able to tell me what size jets were stock in my 600 cfm 4150 DP.

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