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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
    Joined: Sep 26, 2004
    Posts: 3,667

    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
    Joined: Sep 23, 2004
    Posts: 26,406

    squirrel
    Member

    no need for a power valve on the secondary side.
     
  3. Automotive Stud
    Joined: Sep 26, 2004
    Posts: 3,667

    Automotive Stud
    Member

    Cool thanks
     
  4. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    What's the List number on the choke horn????
     
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  5. Automotive Stud
    Joined: Sep 26, 2004
    Posts: 3,667

    Automotive Stud
    Member

    It's 4779-6
     
  6. squirrel
    Joined: Sep 23, 2004
    Posts: 26,406

    squirrel
    Member

  7. Automotive Stud
    Joined: Sep 26, 2004
    Posts: 3,667

    Automotive Stud
    Member

  8. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    Here's a pic of it......
     

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  9. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    The one pictured above shows that it has 4 corner idle mixture screws..... Does yours have that???
     
  10. Automotive Stud
    Joined: Sep 26, 2004
    Posts: 3,667

    Automotive Stud
    Member

    sure does
     
  11. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    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
    Joined: Oct 29, 2009
    Posts: 75

    kaboom
    Member
    from STL, Mo

    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
    Joined: Oct 24, 2007
    Posts: 520

    wildearp
    ALLIANCE MEMBER
    from tucson, az

    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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