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Technical carb question, HOLLEY LIST 4737-2, can't find info...

Discussion in 'The Hokey Ass Message Board' started by hillbilly, Mar 14, 2017.

  1. This carb...is driving me batty.

    It's a double pumper from an engine I sold a fellow a few years back, it was on a SBC, and it ran pretty well, but I cannot find information about this specific LIST number? I found a couple that were close, MoPar stuff...but nothing telling me what I need to know, CFM, etc...

    ...anyone got any of the old books that reveal anything about this chunk o' aluminum? Is it worth messing with or is it ballast?
     
  2. Larry T
    Joined: Nov 24, 2004
    Posts: 7,675

    Larry T
    Member

    1970 383 automatic.
    Chrysler PN - 3512965
     
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  3. Black Panther
    Joined: Jan 6, 2010
    Posts: 1,450

    Black Panther
    Member
    from SoCal

    I Googled it and got 1970-72 Mopar as well..you sure it's a double pumper? Pics that show up in relation to that search show a regular looking 600 CFM or thereabouts vacuum secondary carb...
     
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  4. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    On the HAMB, double pumper means the gas goes into both float bowls...Its sort of like the meaning of "gasser" or "traditional hot rod" on here.
     
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  5. Black Panther
    Joined: Jan 6, 2010
    Posts: 1,450

    Black Panther
    Member
    from SoCal

    Cmon George...lol
     
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  6. metlmunchr
    Joined: Jan 16, 2010
    Posts: 725

    metlmunchr
    Member

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  7. Fordors
    Joined: Sep 22, 2016
    Posts: 2,146

    Fordors
    Member

    I looked for that List number in the books I have and didn't find it but a Google search showed something I never knew. The 4737 Holley is for a Chrysler 383 335 horse engine, with the optional air cleaner, fresh air hood and auto trans. The interesting part is the secondaries are quite a bit larger than the primaries, not just a little, but by quite a bit. It has bowls with nonadjustable needles and seats, a different location for the curb idle screw, but otherwise it pretty much looks like a typical 4160 style Holley. With the big secondaries it has to use a specific throttle body to main body gasket and who knows what else.
    The reason for the bigger secondaries was for the fresh air hood, but I found no CFM info.
    As metlmunchr posted above there was a Carter AVS oddly using the same number, but with an S added- 4737-S
     
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  8. metlmunchr
    Joined: Jan 16, 2010
    Posts: 725

    metlmunchr
    Member

    Sure enough the 4737 Holley shows up in this Holley document http://documents.holley.com/199r10015-1rev1.pdf Once again, no CFM or bore sizes here either.

    Shows it as a 4160 type as Fordors said. Strange thing is, glancing thru the carb numbers in this one, I didn't see any of the common numbers like 1850 or 3310 or 4780.
     
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  9. nope...I've been around long enough to know a double pumper has two accelerator pumps, as this thing does...and it's not a spreadbore like a quadrajet or thermoquad, or the Holley spreadbore replacement.


    Trying to get photos, but my cell phone died...I'm good with mechanical things, this tech crap is best left to the kiddies.
     
  10. Fordors
    Joined: Sep 22, 2016
    Posts: 2,146

    Fordors
    Member

    As mentioned it has larger secondaries, but we made no mention of it being a spread bore like the Holley 4165 series carbs.
    Get help to post pictures if need be, I'd like to see this thing.
     
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  11. DDDenny
    Joined: Feb 6, 2015
    Posts: 12,190

    DDDenny
    Member
    from oregon

    Welcome to the wacky, sarcastic, but oh so correct world of falcongeorge:p
     
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  12. Atwater Mike
    Joined: May 31, 2002
    Posts: 9,775

    Atwater Mike
    ALLIANCE MEMBER

    Senior Mrs. Falcon:
    "Are you doing your homework, George?"

    George:
    "Sure as shootin', Mom..."
     
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  13. I will try to get photos, but I'm afraid y'all will be disappointed.

    I'm sitting here embarrassed of myself...it's not an uncommon carb at all, upon closer inspection it just so happens that someone tried to make the second "7" look like a "3," for what reason I can't figure...unless some creep tried to pass it off as a MoPar replacement? LoL...sorry for the unnecessary use of bandwidth here...

    ...I guess it's just a plain-jane 650 cfm 4150 that has been in the possession of an unscrupulous owner in the past :p

    Should be decent on the .040 over 350 since I'm doing more driving than racing, with only an occasional display of testosterone via my right foot.
     
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  14. jetnow1
    Joined: Jan 30, 2008
    Posts: 1,315

    jetnow1
    ALLIANCE MEMBER
    from CT
    1. A-D Truckers

    Holley made some specific carbs for oddball applications such as the double pumper I have that came off an International truck with a governor. These do not show up on most lists, but an e-mail to Holley
    will usually get you a response within a couple of days showing the original application.
     
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  15. Fordors
    Joined: Sep 22, 2016
    Posts: 2,146

    Fordors
    Member

    Hey, if nothing else we now know there are 4160's out there with really large secondaries. Here are photos from a Mopar restoration 'site. 5031077-A.JPG 5031083-E.JPG
     
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  16. pappatyrone
    Joined: Oct 22, 2007
    Posts: 153

    pappatyrone
    Member

  17. Larry T
    Joined: Nov 24, 2004
    Posts: 7,675

    Larry T
    Member

    That's a little strange, boosters are different in the secondaries than the primaries. And I've got a factory Holley for a 70 model 440 on the shelf that's a plain old 600.

    Chrysler isn't the only one to use different built Holleys, I have an 830 cfm double pumper with factory Chevrolet numbers that Holley doesn't list in their catalog either. The listings you do find list it as Chevrolet carb for Trans-Am racing.
     
    Last edited: Mar 15, 2017
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  18. Fordors
    Joined: Sep 22, 2016
    Posts: 2,146

    Fordors
    Member

    There is a lot more to venturi boosters than I know but I can tell you that the original 3310 was a 4150 style carb and had down leg boosters and a 780 rating. Holley changed it to the 3310-3 (cheapened it up?) for the mass market and made it into a 4160. At the same time the boosters went to straight leg and the rating dropped to 750 CFM. I don't have either carb any longer so I can't say if there was a secondary venturi diameter change at the same time. My point is, does a different booster work better with a particular venturi? Beyond my knowledge for sure, I'm just commenting on things I've seen over the years.
     
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  19. Larry T
    Joined: Nov 24, 2004
    Posts: 7,675

    Larry T
    Member

    About all I know is that the 600s use the booster with the baffle (????) in the center of the booster, most of the larger cfm carbs are open in the center.

    It actually looks like the 383 carb uses the primaries of a 600 and the secondaries of a 750/780.

    As far as to what works better, I guess it depends on the use of the carb, or they wouldn't make straight/dogleg/annular discharge boosters for the same cfm carbs.
     
    Last edited: Mar 15, 2017
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  20. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    ah-ha! NOW it makes sense.
     
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  21. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Straight leg aka nozzle bar boosters pose a greater flow restriction than downlegs. I switched to Braswell two-step undercut downlegs in a 650 double pumper and picked up about 20 cfm per hole on my bench. That and slabbed throttle shafts got me a 1 1/4 by 1 5/16 venturi carb that flowed close to 800 cfm with the choke horn still on it.
     
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  22. Here's another one...it's grimy and will be cleaned up, but a second carb from the pile o' freebies, notice anything amiss?


    [​IMG]
     
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  23. 24riverview
    Joined: Jan 13, 2008
    Posts: 799

    24riverview
    Member

    Main body is turned 180, can only imagine what else is screwed up internally.
     
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  24. ^^^^^ For when you only want a little more secondary action. (spread bore joke. But who's paying attention to detail's ?)
     
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  25. yep...I didn't even know that was possible. a teardown and cleaning will tell if a rebuild is going to do any good. might be an interesting paperweight.
     
  26. my facebook version of this post got a comment of "Absolutely nothing. . It's a boat carb.. also used on many circle track cars"

    I don't see how...even a boat carb would have the choke over the primaries instead of the secondaries, if running a choke at all? LoL at any rate, my day off and I'm going out to tear it down. Will have to wait for the wife's cell phone to come home with her so I can get decent photos of any craziness I find...
     
  27. Larry T
    Joined: Nov 24, 2004
    Posts: 7,675

    Larry T
    Member

    What's the list number on the choke horn?

    It's not a boat carb, they have vents (kind of j shaped) that dump into the venture if they flood over.
     
  28. It's a LIST-4777-2 like the one I originally mentioned in this post.

    I knew it wasn't originally a boat carb, but thought someone might have tried that reconfiguration my friend spoke of, there ARE a lot of wannabe Stroker Aces around here.

    I tore it down, doesn't look like anyone drilled anything out or modified anything other than putting the main body backwards and the metering blocks on the wrong ends :p I got lucky I guess!

    As things come together I'll post pics of the blasphemous sbc swap into a 53 Ford Mainline...it'll come back out when I find the "right" FoMoCo befitting of Henry's blue oval, I just wish the old stuff was as readily available as when I first ventured onto the HAMB in '99-2000...
     
  29. You posted 4737-2
     
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  30. 24riverview
    Joined: Jan 13, 2008
    Posts: 799

    24riverview
    Member

    See post #13.
     
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