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Old 12-01-2017, 10:10 PM   #1
overdrivesteve
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Default New 2300 carb questions

Hi,
I just recently acquired a new (to me) carburetor. It came from an older 60's pickup but I don't know which V8 engine. Sorry I don't have any pictures (my camera broke) but its a 2-barrel 2300. The stamped numbers:

443269-C91
List 4308-1
2363

I believe its OEM but can anyone give me a bit more information on it please - such as its CFM and original intended engine?

What jets and power valve and acceleration cam and nozzle do you recommend? This will be for a stock 304 V8 heavy-duty 1.5-ton truck living at 4000 ft elevation. I've been reading up on the topic, but this will be the first carb I ever rebuild.

Also to make it more off-road worthy I read I should add a short whistle to the top metering block vent. Can anyone suggest any other carb modifications (short of fuel injection) to allow the truck to not stall on steep hills (especially uphill).

Thanks for your help.
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Old 12-02-2017, 04:42 AM   #2
meisterj
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Default Re: New 2300 carb questions

I just did my first carb rebuild, on a 2300 for my '74 scout II with a 345. There is a ton of good information in the following thread. Take the time to read through it: http://forums.ihpartsamerica.com/forumdisplay.php?f=31 .
Also do a google search, there is a ton of information about this carb out there. Last, check out the Holley site for information on the 2300 including the directions that come with a new one.
After a couple hours reading and a couple hrs on the carb it was rebuilt and the engine was running great. Rebuild kits are available here and elsewhere on the web, and come with basic instructions. Oh, I also watched a couple youtube videos on rebuilding a holley carb. Learned a great tip to replace a plastic float if you have one with a nitrophyl float. Apparently the brass hinge on the plastic floats is too flimsy and bends over time allowing too much fuel into the bowl. I found that exact problem causing it to run rich.
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Old 12-02-2017, 09:09 AM   #3
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Default Re: New 2300 carb questions

I couldn't find that exact combination of List# + IH P/N + extension in one listing in my documentation. The first time I see list 4308 show up, albeit minus the 'dash 1', is in 1969 atop a 304 with BW auto trans. The first time that list number shows up with the dash 1 attached is 1973, also atop a 304 with A-727 auto trans. It is an OEM version.
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Coal Trickle - '99 Dodge Ram 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500
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Mongo - '71 1210 Std Cab 2WD - 345/TF727/RA17 D60 4.10 Trac-lok - "Mongo love candy! Duh, huh, huh!"
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Old 12-02-2017, 06:36 PM   #4
overdrivesteve
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Default Re: New 2300 carb questions

Quote:
Originally Posted by Scoutboy74 View Post
I couldn't find that exact combination of List# + IH P/N + extension in one listing in my documentation. The first time I see list 4308 show up, albeit minus the 'dash 1', is in 1969 atop a 304 with BW auto trans. The first time that list number shows up with the dash 1 attached is 1973, also atop a 304 with A-727 auto trans. It is an OEM version.
I called Holley Performance today - all they could do was to confirm what you told me - that it was built on the 236th day of 1973 for a 304 with an automatic transmission. And it's an OEM carb which means only IH can sell parts for it. Otherwise they have no other info on this carb at all, including specs, parts, or rebuild kits.
The Holley rep also said all rights to their vintage carbs, parts, vintage part manufacturing, and parts sales now belongs to a company called Daytona Parts Co. and I should call them. (Can I give Daytona's phone number, or would that be too close a conflict with Jeff's business?)

Upon further research I did find the following info on the carb:
Rebuild kit: KT-5246B
Base gasket: 408
Acc Pump: 3
Needle and seat: 525A
power valve: unknown
Jets: unknown

I don't know if these are Holley part numbers or just the sku numbers of the particular carb company I found these numbers at.
Does IH Parts America sell rebuild kits, various jets, power valves, accelerator cams etc for tuning these carbs?

The rated CFM is still unknown at this time.

Thank you everyone for any help or info you can give regarding this carburetor.
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Old 12-02-2017, 08:45 PM   #5
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Default Re: New 2300 carb questions

The CFM should be somewhere close to 275. Might be a little higher, but certainly less than 350. For the most part, using the HLY-37-1543 Fast Kit from Holley has been the recommended approach for refreshing these OE carbs.

http://www.ihpartsamerica.com/store/...-CARB-KIT.html

This kit is not specific to any one list number. Its somewhat of a one size fits all approach. There are far too many variations and list numbers for one single kit to cover every possible nuance, but with careful gasket matching between old and new, one can generally expect a high degree of success by going this route. The blue gaskets and other parts in the Holley kits are of a very good quality. I can't vouch for quality of any other brand kits as I have no familiarity with them.
You'll also want to have one of these guys under the carb...

http://www.ihpartsamerica.com/store/...-CRB-2BBL.html

Identify and report which jets your carb has in it now. They might be fine. If replacing them turns out to be a good idea, they are readily available from any speed shop or performance minded auto parts store.
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Favorite hobby...Driving Salma Hayek in my Scout

Coal Trickle - '99 Dodge Ram 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500
Hooty - '74 SII - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/RC 4" SUA/34x10.5 TSLs/33g Fuel/HFT 8k winch
Mongo - '71 1210 Std Cab 2WD - 345/TF727/RA17 D60 4.10 Trac-lok - "Mongo love candy! Duh, huh, huh!"
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Old 12-17-2017, 02:03 PM   #6
overdrivesteve
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Default Re: New 2300 carb questions

Does anyone know which IH parts manual, MT-??? contains this carburetor?
Thanks.
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Old 12-17-2017, 06:51 PM   #7
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Default Re: New 2300 carb questions

It is listed in the MT-130 Scout II parts manual as one of the numbers that a 443273C91 replaces. There is not really a clear application, just if you have one replace it with this one. It is in the section for 72-73 304 and 345 w/o emission controls.
Update: I also have an older version of the MT-130 and in that one it's listed as Export, both for 304 and 345. I scanned the page to show it.
Attached Images
File Type: pdf carb1.pdf (305.8 KB, 33 views)

Last edited by farmall57; 12-17-2017 at 08:41 PM.. Reason: Added new info and pic
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Old 12-17-2017, 09:27 PM   #8
overdrivesteve
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Default Re: New 2300 carb questions

Quote:
Originally Posted by farmall57 View Post
It is listed in the MT-130 Scout II parts manual as one of the numbers that a 443273C91 replaces. There is not really a clear application, just if you have one replace it with this one. It is in the section for 72-73 304 and 345 w/o emission controls.
Update: I also have an older version of the MT-130 and in that one it's listed as Export, both for 304 and 345. I scanned the page to show it.
Thank you so much.

Would you mind please posting the other part number pages that go with the 443269C91 carburetor.

Thank you.
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Old 12-18-2017, 07:40 AM   #9
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Default Re: New 2300 carb questions

Don't mind at all, holler if you need any other stuff I might have. I've also copied the relevant pages from the Holley book. I'm assuming 1A is the same as 1 but I do not know that.
Attached Images
File Type: pdf carb2.pdf (314.1 KB, 31 views)
File Type: pdf list.pdf (252.0 KB, 33 views)
File Type: pdf illus63.pdf (85.5 KB, 26 views)
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Old 01-08-2018, 04:51 PM   #10
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Default Re: New 2300 carb questions

Quote:
Originally Posted by farmall57 View Post
Don't mind at all, holler if you need any other stuff I might have. I've also copied the relevant pages from the Holley book. I'm assuming 1A is the same as 1 but I do not know that.
Thank you Farmall57, your pdf files have been very helpful.

Today I finally cracked open the carb to see what I actually have. To me that carb looked unmolested. That's one of the reasons I decided to go with it. But when I opened it, the jets and whistle are missing. Everything else seems to be there. Fortunately the metering block is stamped with the same list numbers as the main body otherwise I'd throw the carb away - don't want to waste time rebuilding something cobbled together with mis-matched parts.

According to the pdf part files, it appears the jets should be part number 451-809-C1.
Am I reading that correctly?

I don't know what jet that is, but I did find a IH dealer who has some NOS jets with that IH part number.

My only other complaint is that the float is made of plastic and not brass. So I'll be looking for one of those too.

I'll post anything else I discover about the carb.

Thanks for your help, everyone.
Sorry, no pics, my camera is still broken.
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Old 01-08-2018, 08:58 PM   #11
FDChappie
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Default Re: New 2300 carb questions

Since 51 jets are common in the oem carbs, I'd guess that is what 451 means. Since you'll be running gas with 10% alcohol, 52's are suggested. My '71 Tette would lean surge with the stock 51's. 52's ran perfect and it even got 14 mpg on a tank with them.
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Old 01-08-2018, 11:04 PM   #12
farmall57
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Default Re: New 2300 carb questions

If you look at the Holley pdf of the breakdown of the carburetor you will see the jets are key #80, then if you go to the listing of the R4308-1A and find key #80 you find the Holley part number is 22A-40-52, which is jet size 52, the original jets for that carb. This only works for the listings on that page that show TV 6-3, the others refer to other TV (typical view) pictures.
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Old 01-09-2018, 08:59 PM   #13
overdrivesteve
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Default Re: New 2300 carb questions

FDChappie, thanks. Great info and a goal to shoot for - a 392 in a truck that gets 14mgp! I don't recall, is a T-36 an overdrive? What r&p gear and tire size do you run? And is it 4wd?
I hope in the end I get close to 14mpg in my truck with its little 304.

And wow farmall57, so that's what those numbers mean. Now I understand. Great info!
What do the other numbers mean above the gasket number? And is that gasket number the base to intake manifold gasket?
Thank you.
.

Last edited by overdrivesteve; 01-09-2018 at 09:23 PM..
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Old 01-09-2018, 09:28 PM   #14
farmall57
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Default Re: New 2300 carb questions

Here is the explanation page from the Holley book. I think the gasket number listed is a gasket kit. Sadly a lot of those numbers are no longer good.
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File Type: pdf carb explain.pdf (42.9 KB, 29 views)
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Old 01-10-2018, 09:04 AM   #15
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Default Re: New 2300 carb questions

My T'ette had a 345 when it got the 14 mpg. The T-36 is non-OD and the R&P is a 3.54 so it is geared fairly high. And it's a 2x4. The 392 that is in the truck now gets around 12.5 on the freeway.

While you're in the carb look at the power valve to see at what vacuum level it opens and then try to keep the vacuum above that level when driving.
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