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Technical WTH? 6 months ago fine, now Holley 850DP leaks like sieve

Discussion in 'The Hokey Ass Message Board' started by ThisOneGoesTo11, Nov 2, 2019.

  1. As the title suggests, anyone else getting surprised like this? LIST-4781 stamp on air horn
    2535 date code I assume to be 253th of 2005 (Sep 10th?)--or is it 1995...either way non ethanol rubber parts most likely.

    Other comment is - 1964 Ford 390, unknown history, Edlebrock intake, this 4BBL holley has no choke /plate/spring /linkage , yet starts well even in 32F temps, do I need to add a choke plate, linkage...or can this be made to work in Eastern PA ?

    Seems like alot of carb for a stock 390, I have a Ford autolite C9LF A from (I think ) a 1969 lincoln, has a choke would I be better off rebuilding/installing that?

    Thanks for advice and comments...
     
    Last edited: Nov 2, 2019
  2. a 15-25 year old carburetor needing a refresh, wouldn't surprise me.
    a properly working choke is a good thing.
     
    Boneyard51 likes this.
  3. Boneyard51
    Joined: Dec 10, 2017
    Posts: 6,451

    Boneyard51
    Member

    A carburetor that runs good cold, is probably running rich when it’s hot.






    Bones
     
    Truck64, tb33anda3rd and VANDENPLAS like this.
  4. RmK57
    Joined: Dec 31, 2008
    Posts: 2,694

    RmK57
    Member

    An 850 cfm double pump is much more than what a mild 390 needs. The 850 were kind of pigs when they were new, I wouldn't use one on anything.
     
    Mark Yac likes this.

  5. Penetrator
    Joined: Aug 25, 2011
    Posts: 514

    Penetrator
    Member
    from SK CAN

    It leaks where?

    Late model Holleys are famous for failed accelerator pump diaphragms, especially when they sit for a season with alcohol blended fuels.

    .
     
    Truck64 and Boneyard51 like this.
  6. A weird post since the title and the commentary don't jive...lol
    So do you want advice on fixing the current carb or advise on using the stock ford Holley ???
     

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