What is the CFM on my 292.
The carb ID on it is D2PF JA A2M19.
I looked at the carb body for a venturi diamater and couldnt locate it.
I know that it is a 72 motorcraft unit so I am assuming that it is a ford replacement carb.
Has anyone put a holy 350 2bbl on the Y block with any success?
The blue thunder intake is a bit pricy for my "toy". I am looking to eventualy put a mild cam in it and headers so only want to do this once.
any help would be great, Thanks.

 

Recall that 4v and 2v carbs are rated differently.
4v carbs are flowed at 1.5" Hg
2v carbs are flowed at 3.0" Hg

So, that Holley 350cfm 2v carb will only flow as much air as a 250cfm 4v carb
(the factor is approximately 1.414)

Most of the Autolite 2v carbs are 200cfm to 250cfm using the 4v rating system, the smallest and biggest are just outside that but they are rare.
if you guess your Autolite 2v is 225cfm (at 1.5" Hg) you'll be close.

What would you gain?
Well the below is computer generated, but dyno tests of the y-block aren't exactly filling the grocery store shelves.
On a 292-2v:
Change from 200cfm 2bbl to 250cfm 2bbl: + 8hp
Change from 200cfm 2bbl to stock iron 4v and Autolite 4100 500cfm 4bbl:
+ 25hp
Change from 200cfm 2bbl to hipo alum 4v and Autolite 4100 500cfm 4bbl:
+ 36hp

Even if you have to buy an intake, it is the easiest and most liveable 36hp you will ever add. Hopefully the new ones will not be too pricey!

 

This info is from the FTE forum on fuel injection, carburetion...:

"These following numbers are for Motorcraft/Autolite carbs. This number can be found on the side of the float bowl, right behind the accelerator pump rod, inside of a circle. The number on the right corresponds with the cfm rating on the left. Thanks to chas1234 for these numbers. The first numbers are the venturi size, the second is the corresponding cfm.
These numbers are for 2BBL carbs only.

Number = CFM
.98 = 190
1.01 = 240
1.02 = 245
1.08 = 287
1.14 = 300
1.21 = 351
1.23 = 356
1.33 = 424

These numbers are for 4BBL carbs, courtesy thrillseeker.
1.08= 480cfm
1.12= 600cfm
and a rare very rare
1.19= 670cfm."

This site http://www.network54.com/Forum/88781/ deals with primarily Autolite carbs. The expert there is Bill White. According to him, a better than stock 292 can only handle up to 1.14 venturi sized Autolite. The explanation was believable, and included the fact that Autolites are basically not tuneable like Holleys. So I am replacing my 1.02 with a 1.14, which will give a little more power but hopefully still perform well in the mileage arena.

A 292 I recently tore down had a 1.23 Autolite 2V on it, and all combustion chambers were very black.

 

So going to a 350 cfm holly and jetting it down would be acceptable though finding a 1.02 autolite of a 302 would do me the same thing for less. I looked on the float bowl again and I have two didgits indicated though the casting is bad and they are essentialy illegible.

In a nutshell I've a 190 cfm motorcraft.
would the holly or a motorcraft of larger size be a better carb for my toy?
Im not looking for a ton of power just a good 8 month carb. (I live in ND.) The one on there now starts when its 20 below zero on contacts.

Any good opinions on a 2bbl setup for a mild (I stress mild) street engine would be good.

 

In ND cold weather, for SURE I'd go with the Autolite!
I've never known a Holley to cooperate like an Autolite carb in the winter. My trick was to run an Autolite in the winter, then swap to a Holley for warm weather. Still is.

Sounds like you have the tiniest 2v Autolite of all, just going to a bigger one will help a lot. From the 0.98 to the 1.14 version you'd have about 50% more CFM, that would really help. I computed a gain of 13hp just from that change!

As far as the Autolite 4v 4100 CFM's, I've seen different sets of CFM numbers (all at 1.5" Hg) on them, never measured them myself. The Ford books usually say:
1.08 = 440cfm
1.12 = 480cfm

Over on the FE Forum, Bob Sprowl got tired of seeing the "600cfm 1.12" number so he had a few of the carbs flowed. He got:
1.08 = 440cfm or 443 or something
1.12 = 500, 505, 501, 520, 500 or something like that, he had several of them flowed.
I THINK these were dry flows, so wet would be a little less.

But if the 1.12 Autolite 4100 flows 600cfm, I'd sure like to see those test results, those are pretty small venturis to flow that much.
In any case, if you can find a 4v intake, I'd still run an Autolite in the winter, and the 1.12 version, whether it's 480 or 500 or 600 cfm, would be fine for your stock 292.

 

I dont know what autolites came on 302s. They werent 1.02 but larger. So in a 2V you want 1.02 to 1.14. The 1.02 is stock on 60-64 y-block trucks, maybe other models too. The smaller carb has great throttle response. Dont know about the larger because it isnt installed yet. Others have tried the 1.12 4100 on a 292 and had poor results. A member of y-blocksforever, going by Holun, comes immediately to mind. The larger 4100s were made for much larger displacement motors than the 292, and bog, hesitate, run rich and give you fits. Also trying to find a good affordable 1.08 4100 that is not a California emissions carb can cost money due to misrepresentation by the seller. If going 4V get a Holley 390 cfm or Edelbrock 500 cfm. Go to the website I mentioned and ask ol Bill some questions.

If you want a 1.02, mine is rebuilt as of 2000 miles ago, and available.

 

So, autolite is the way to go. How much for the 1.02 autolite "46"?

 

Flipkos, I will send you a PM. But first let me say I like Autolites a lot! Werby has a question on the afore mentioned website which will be interesting to watch. The 1.02 will work very well, give like I said very good throttle response, the best mileage you can get. Due to the flow limitations an rpm ceiling of 4000, which is not a problem for many, but may be for you.

Mike