Identify This Carb???
 

This is a carb(s) that I inherited when I bought the boat.
I've been told that they are 750's that now flo out to 830's
The number 3913 and 6R3752B has been stamped on the body by the secondaries.
On the primary side is stamped P-46
On the secondary side R-24
I really would like to know what I have to work with.
Thanks

Re: Identify This Carb???
 

..

Re: Identify This Carb???
 

It.... a..... looka like a Holley.... :D

Re: Identify This Carb???
 

With the choke horn machined off. :rolleyes:
On my monitor it looks like it had some type of tag on the top of the bowls :confused:

Re: Identify This Carb???
 

The number you are looking for is/was on the choke horn... which appears to have been cut off... :( Without that... it just looks like a 4150 double pumper to me. Sorry.

Re: Identify This Carb???
 

The tags were off when I got it.
The metering blocks have 11180 stamped on them.
The carbs were done by well known carb shop in Mississippi or Louisiana.
Maybe someone from that area could give me some insite.

Re: Identify This Carb???
 

Maybe I should just trash the damn things and feed my engines
with an 850 Mighty Demon? :mad:
They're pretty funky looking old carbs ;)

Re: Identify This Carb???
 

Get a caliper and measure the ID of the body bore and the the throttle bore. I can get it pretty close for you then. The only reason they say it flows 830 CFM is because some idiot milled the choke shroud off instead of using a substack.

Roby

Re: Identify This Carb???
 

1.68" throttle bore
2.00" body bore

I took the body measurement of one bore from the outside machined edge to the center of the body?
Is this the correct way to measure?

Re: Identify This Carb???
 

looks like an 850.Turn it over and look at the flaps.180=850cfm.172=750cfm

Re: Identify This Carb???
 

Primaries=172
Secondaries=173

Re: Identify This Carb???
 

from the looks of the original height of the choke horn and that it has 4 corner idle I would have to say it was a 850 with a list # 4781-4 or higher. it does not look like a 830 because of the boosters and the linkage.

Re: Identify This Carb???
 

Hey, if you want to trash 'em, I'm a buyer.

Re: Identify This Carb???
 

1050-750 has those diameters

Re: Identify This Carb???
 

If it has 172 stamped on the primary butterflies, and 173 stamped on the secondary butterflies it is not a 4781 850. 850 carburetors have 1-3/4" Butterflies. 1-3/4" butterflies have 180 stamped on them. It is most likely a 750 carburetor. If you measure the center of the venturi with a pair of calipers around the booster I can tell you specifically.

Re: Identify This Carb???
 

It is a Holley 750 Double Pumper 4779 that has aparently been outfitted with Annular boosters. It is not however not a marine carb.

Roby

Re: Identify This Carb???
 

Why go with annular boosters?

Re: Identify This Carb???
 

Substack I use to use them and I really had to jet up. I felt an improvement but at the time I was only using a 650 CFM carb. This is much better than milling the choke shroud.

Roby

Re: Identify This Carb???
 

Roby,

Not sure what carburetor you're looking at, the pictures that were posted by strikinLightnin

Re: Identify This Carb???
 

Yea those are what I was refering too. Was I mistaken about something?

Roby

Re: Identify This Carb???
 

That carburetor has downleg boosters in it, not annular.

Re: Identify This Carb???
 

Can I play, can I play. Actually I can't help but I do feel your pain. I went throught the same thing this spring when I decided to rebuild my Holley. It turns out I have a 4160 with the chock horm milled off and a secondary metering block added. I even called Holley but without the numbers that where on the choke horn they couldn't even help. A guy on another site was able to ID it without even seeing a pictures. Thank god for sited like this. :cool:

Re: Identify This Carb???
 

I wan't to play too. Tried the substack on my 850 dbl pump with choke horn/no choke saw minimal gain 3hp. Next time on dyno tried 850 proform carb main body with everything else the same went from 563hp to 581. Now that's a bargain.

Mark

Re: Identify This Carb???
 

Thanks for clearing that up. I sat here and thought about it for awhile but is has been many years since I messed with carburetors.

Roby