Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: HELP! what kind of carb do I have??
          
   
   

Reply To Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 25
  1. #1
    cujoe822's Avatar
    cujoe822 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2009
    Location
    Lansing
    Car Year, Make, Model: 83 pontiac grand Prix
    Posts
    22

    HELP! what kind of carb do I have??

     



    Hey fellas! I just bought a new carb from ebay. Its supposedly a Holley 850 double pumper, completley redone. Im trying to find an id number to verify this, and buy a rebuild kit. It does not have a choke tower. the only number I can find on the main body is 6R2762 stamped on the top of the carb.
    Attached Images
    Last edited by cujoe822; 08-16-2009 at 11:46 PM.

  2. #2
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2003
    Location
    Zephyrhills, Florida, USA
    Car Year, Make, Model: '32 Henway
    Posts
    12,423

    Type #4150
    List #4788
    6.5 power valves front and rear
    #80 jets all around

  3. #3
    cujoe822's Avatar
    cujoe822 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2009
    Location
    Lansing
    Car Year, Make, Model: 83 pontiac grand Prix
    Posts
    22

    wow! thanks! how did you figure that out? i did open it up. it doesnt have 80s all around...not sure about the power valves.

  4. #4
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2007
    Location
    Mesa
    Posts
    1,385

    Quote Originally Posted by techinspector1 View Post
    Type #4150
    List #4788
    6.5 power valves front and rear
    #80 jets all around
    Just to add to Tech's specs, it's rated from the factory @ 830 cfm.
    With the base plate addition, it may breath quite a bit better.
    Even Holley underated thier carbs a little so if you tear it down and bring it back to specs, this should be a formadible piece to use.
    Your pic shows some "shelf" time and needs to be cleaned up in all the orifices and throttle plates, etc.
    What if the "Hokey Pokey" is what it's really all about?

  5. #5
    cujoe822's Avatar
    cujoe822 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2009
    Location
    Lansing
    Car Year, Make, Model: 83 pontiac grand Prix
    Posts
    22

    so would you guys recommend some kind of rebuild kit to bring it back to specs?

  6. #6
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2007
    Location
    Mesa
    Posts
    1,385

    Tear it down carefully first, clean up the rust and crap that's visible in the pics.....orifices in the air bleed department and make sure you rorifices in the metering blocks and base plate are clear and have no junk in them.
    The blue metering block gaskets show that there are some resuable parts in this thing.
    Tear it apart first and let's see what's in there.
    What if the "Hokey Pokey" is what it's really all about?

  7. #7
    cujoe822's Avatar
    cujoe822 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2009
    Location
    Lansing
    Car Year, Make, Model: 83 pontiac grand Prix
    Posts
    22

    thanks for your advice! much appreciated..i did notice a around the secondary accelerator pump. plus the secondary squirter wasnt squirting fuel...

  8. #8
    skids72's Avatar
    skids72 is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2005
    Location
    Lafayette
    Car Year, Make, Model: 68 Firebird 439 BBC
    Posts
    745

    Actually, I'm pretty sure it is a list 9380... note the big annular boosters... this is the same carb I have... the list number is normally on the choke tower but yours has been milled off (which is a good mod!) These are race carbs for stocker classes and is a very good carb capable of supporting quite a few horses. (best you could get in a 4150 until they recently came out with a 950cfm... but this is the only 4150 that came stock with the annular boosters)

    850cfm 78 jets from the factory (all around or "square") 6.5 power valve 30cc primary 50cc secondary accel pumps.

    To be sure, you can check the throttle bore diameter... 9380 is larger at 1-3/4" while the 4788 (830cfm) has throttle bore 1-11/16"

    Here is the list sheet: http://www.holley.com/data/TechServi...%20Listing.pdf

    BTW: You need to back off the primary accelerator pump adjustment... it is all bound up! Loosen the nut on top just to the point where there is no slack between the pump arm and lever. With it adjusted like that I would be surprised if the pump diaphragm isn't torn.

    -Chris
    Last edited by skids72; 08-17-2009 at 09:02 PM.
    Paint don't make it no faster

  9. #9
    skids72's Avatar
    skids72 is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2005
    Location
    Lafayette
    Car Year, Make, Model: 68 Firebird 439 BBC
    Posts
    745

    Yeah definitely 9380.... 4 corner idle
    Paint don't make it no faster

  10. #10
    cujoe822's Avatar
    cujoe822 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2009
    Location
    Lansing
    Car Year, Make, Model: 83 pontiac grand Prix
    Posts
    22

    thanks chris! any advice will help.. i will measure the thottle bores to make sure. i also noticed that pump arm. probably why its leakin..i think my best bet may be to get a rebuild kit,and get it cleaned up. i also noticed it has 78/80 jets in it. plus two pbs. one of which looked pretty nasty. rust etc

  11. #11
    skids72's Avatar
    skids72 is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2005
    Location
    Lafayette
    Car Year, Make, Model: 68 Firebird 439 BBC
    Posts
    745

    Holley rebuild kit p/n 3-648 will have everything you need including detailed instructions. Summit has backordered to 9/7/2009... Might try Jegs or your local auto parts store can order for you.

    -Chris
    Paint don't make it no faster

  12. #12
    cujoe822's Avatar
    cujoe822 is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2009
    Location
    Lansing
    Car Year, Make, Model: 83 pontiac grand Prix
    Posts
    22

    wow! thanks alot! il def look into that. now to clean everything just carb cleaner,and a soft brush?

  13. #13
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2007
    Location
    Mesa
    Posts
    1,385

    That's an add on secondary metering plate from another carb.
    The base plate was a mod to convert it to a double pumper. This carb is a true vacuum secondary carb.
    Where the metering blocks came from is a mystery because this has pieces from all over. To double check the throttle bores, flip it over, remove the base plate and measure the body because the base plate may be off just enough to fool you.
    This can be a very workable piece, unfortunately it's been modded to the point you are going to have to tear it down to do a "ground up" to create something to be dependable.
    What if the "Hokey Pokey" is what it's really all about?

  14. #14
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006
    Location
    Bartlett
    Posts
    6,831

    that is a carb that I wouldn't work on and I have fixed a lot of very owner abused carbs--
    My usual first step is to identify the carb, stock specs and then go from there ---this one---typical E bay stuff

  15. #15
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2007
    Location
    Mesa
    Posts
    1,385

    Can't fault you there Jerry.
    I just dug out three virgin carbs out of the core bucket. All three carbs that have that matching 5271/5275 metering block in your rear, are off of 3310 list carbs from the primary side of the carb.
    This thing has hodge podge parts but can still be saved.
    What if the "Hokey Pokey" is what it's really all about?

Reply To Thread
Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink