Holley 2300 tech specs

C

coneto

Member
I recently picked up a Holley 2300 from a junk yard. I'm just looking for the tech specs of the carb itself. I know what Scout truck it came off of. I just want the carbs info.
 
Well this is what I have on it. If you contact Holley tech support they May have the specs.

Tom

year engine model | - - - - - - - - - - - - carburetor - - - kit
1966 8 304 Holley 2300 1711 2 151787-r92 2920
 
Is there any way to know what the cfm for the carb is just by those numbers? Or is there some way to tell/check on the carb?
 
I pulled it off a, I think, 66 IH pickup 304. So yes it's a oem Scout carb but I don't know the history of that truck. How can you tell it's a 250 cfm carb?
 
Sorry, I did mean 275 cfm. So if I take the throttle plate off and measure the diameter of those holes, they should be 1 1/8 inch wide for 275 cfm? I measured them and they both measure 1 1/2 inch wide. I'll take a pic and post it here to make sure I'm doing it right.
 
Here is a pic I promised showing me measuring one of bores. As you can see it measures out at 1 7/16 inches almost 1 1/2 inches wide. If I did it correct then what cfm 2300 is this? If I did it wrong then tell me the correct way to measure those bores. I'm only trying to figure this out so when or if I decide to sell this carb I can accurately describe this 2300.
 

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You are measuring the 'base/bottom' of the carb 'main body'. Those openings are the bottom end of the venturi. Measure the top of those passages to get the 'diameter' of the opening. If the diameter is 1 1/8", the carb is the 275cfm. If the opening is 1 3/16", it is the 350cfm carb.
 
My problem, and I'm assuming a common problem, is that with a tape measure I get conflicting results. I just wish those numbers on the carb told me that info. If someone knows please tell me.
 
Like bill wrote,
if you look further up past where you measures in the photo, you can see the booster venturi, the
1-1/2 bore necks down at that area, measure the smallest diameter area there. That should measure 1-1/8.

All messing around aside, the list and part number you gave at the beginning are for a 304 and it will be a 275 cfm carb......... Period.
 
I'm beginning to agree that I have the 275 cfm 2300. I'm going to call Holley just to conferm and for my piece of mind. Thanks everybody for putting up with me and for the help.
 
Just out of curiosity but do the jets have any bearing on the cfm? I just checked the jets on my 2300 and they both have 60 stamped on them.
 
coneto said:
just out of curiosity but do the jets have any bearing on the cfm? I just checked the jets on my 2300 and they both have 60 stamped on them.
Click to expand...

No they do not.

Cfm is the short version of "cubic feet per minute".

That is the maximum volume of air that the carb can flow at wide open throttle (wot).

The jets meter the liquid fuel into the airstream at the venturi.
 
coneto said:
just out of curiosity but do the jets have any bearing on the cfm? I just checked the jets on my 2300 and they both have 60 stamped on them.
Click to expand...

The 'normal/usual' main jets for the 275cfm Holley 2300 carb would be marked as #51, 52 or #53. Depending on the application. The #60, 61, 62 or 63 jets were used in the larger 350cfm carb. Again, depending on the application. The 'jets' are all the same 'physical size' and can interchange in the metering body. The 60s jets in the 275cfm carb will be dumping too much fuel into the airstream and the engine will be running very Rich above idle speed. If the carb is the 350cfm version, the #60 main jets would be correct for like 7,000 to 11,000 ft elevation, using the e-10 fuel! Need to really determine the size = 'cfm of the carb', and install the correct size main jets and power valve. :ihih:
 
While the jet size May seem odd, the IH part number and list number are both for the 304 application and would be 275 cfm.
 
The #60 jets are correct for the list 1711 carb according to my Holley spec book, and it is listed as used on 1966 304. Also uses a 5.0" power valve.
I also looked thru my IH service manuals and am unable to find the 1711 carb listed anywhere, but I did find this spec chart and I think you'll find that the 1706 carb is probably the same as the 1711 except it has a governor. Notice the 1-9/16 flange and the 1-1/4 venturi.
 

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Farmall57 I think my carb is closer to the 1710. If you look at the picture I posted, you will see that the bottom of the venturi is 1 1/2 inch wide. Which matches more with the 1710. I honestly believe that I have the 275 cfm model. I don't live above 7,000 feet. I live in the central valley of California. We do have most if not all gas stations in my home town that have gas with 10% ethanol. So is having the 60 jets ok or should I get a renew kit with the correct jets. Also I noticed that the metering block has a four digit number stamped into it. The number is 2325.
 
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