All Small Six Carburation

[Frank]

Evening folks, anybody want to opine on using a motorcraft 2100 w/ 1.21 venturi for my 200 build. I also have a 78 large log that will be utilized. Again I must remind all that I am trying to acquire the parts for a good little sleeper street rod, and I'm a noob.

A 1.21 is a good carb and will work. If you can find a smaller one it would perform better at off-idle and lower rpm cruise.

The 1.21 carb has 351cfm, the 1.14=300 cfm, the 1.08=287cfm.
A 200 engine draws about 200 cfm of air @ 4000 rpm. Using the smallest carb for the application has the advantages of better metering, economy, and low-end torque and response because the air is moving quickly over the venturi. The "small limit" is full throttle power, as the carb is nearing it's max flow capacity vacuum increases, and max potential power is restricted. If your car is a gentle-drive cruiser the smaller carbs will be more effective.

As has been said, the Rochester 2 barrel carbs have the advantage of having a smaller mounting footprint than the Ford carbs.

 

[nearGettysburg]

Provided sans comment

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Beautiful work. Enough to make any Triumph/MG owner weep for joy! ( and you get the added joy of the "tinker's delight" of SU carbs.)

 

[Gary Elliott]

where can I find a large log carb adapter to fit a 1bbl carb on the manifold of my 250 4.1 ltr.

 

[bmbm40]

Might be some useful info here:

carb. spacer problem

I am new to this site, and am looking for help with a carb. spacer situation. I have a transplanted 250 6 cyl. from a 1975 Granada in my falcon. The engine has the manifold as part of the cylinder head. The car came to me without a carb or spacer plate. I have purchased both part#s V197-17812A &...

fordsix.com

 

[78_200_C4]

Large Base Rochester Marine 2V on DIY steel adapter on a D7 head

1965 200 air cleaner

Enlarged intake bore D7 head

 

[rocklord]

The Rochester 2V and Carter BBD have the same mounting pattern. The Carter BBD can be found on 60s Chrysler V8s and Jeep inline sixes.

 

[Frank]

The Rochester 2V and Carter BBD have the same mounting pattern. The Carter BBD can be found on 60s Chrysler V8s and Jeep inline sixes.

Thanks! That's useful info! That Carter is a tidy little unit too. Haven't ever gone into one. My son has one on the shelf off a V8 Chrysler. Told him to hang onto it, there's more to practical functionality to those compact 2V's than meets the eye.

 

[rocklord]

Thanks! That's useful info! That Carter is a tidy little unit too. Haven't ever gone into one. My son has one on the shelf off a V8 Chrysler. Told him to hang onto it, there's more to practical functionality to those compact 2V's than meets the eye.

The Australia 250 2V head uses a Stromberg WW 2-BBL carburetor which is the same pattern as the Rochester 2V and the Carter BBD. The differences may be which side of the carb the linkage is on.

Holley sells a Rochester 2V Sniper and BBD Sniper TBI system.

 

[78_200_C4]

The Rochester 2V and Carter BBD have the same mounting pattern. The Carter BBD can be found on 60s Chrysler V8s and Jeep inline sixes.

There is a large base and small base Rochester 2V. The large base is much larger than the Carter BBD and the small base Rochester 2V carb. Photo is a large base Rochester Marine carb 500 cfm V8 353 cfm 2v ratings. It is very much larger than any BBD carb.

 

[Frank]

There is a large base and small base Rochester 2V. The large base is much larger than the Carter BBD and the small base Rochester 2V carb. Photo is a large base Rochester Marine carb 500 cfm V8 353 cfm 2v ratings. It is very much larger than any BBD carb.

View attachment 23356

Looking into the BBD for the first time, they range from 260cfm to 365cfm. All with the same base, I assume? A metering rod carb too- there's good potential in this dinosaur for a small displacement engine.

Carter BBD Rebuild Specifications

www.carburetor-parts.com

 

[78_200_C4]

Looking into the BBD for the first time, they range from 260cfm to 365cfm. All with the same base, I assume? A metering rod carb too- there's good potential in this dinosaur for a small displacement engine.

Carter BBD Rebuild Specifications

www.carburetor-parts.com

You would want to run the older low top small base BBD 2V. The air fuel enrichment mixture can be easily adjusted with small thin washers.
Good luck with an auto choke unless you install a high top BBD jeep auto choke carb that will have to have the throttle lever modified (welded).
I would install a Rochester small or large base before any BBD carb.

 

[Frank]

I would install a Rochester small or large base before any BBD carb.

No doubt! 100% agree.

 

[2drwagon61]

I’m building a 200 cubic inch.short block is a 1976 - 30 over-head is a 1979 big log competition type valve job and milled 60.. Howard’s 2800280 cam- stainless headers- pertronics distributor- . My question is which carburetor should I use- I don’t particularly like a Weber. I like the holley 350 2 barrel. But is it too big?? It’s a daily driver and I don’t want to mill and fill the intake- also I need info on where to purchase a nice billet adapter would like helpful comments- please don’t tell me I need an aluminum head or tons of machine shop work.

Hi, I am working on a 200, my head is from a 78, I am ordering the carburetor adapter plate from Vintage inline, are they LARGE LOG ?

 

[bmbm40]

Large Base Rochester Marine 2V on DIY steel adapter on a D7 head
View attachment 23337
1965 200 air cleaner
View attachment 23338
Enlarged intake bore D7 head
View attachment 23339

I really like that cold air intake set up. So the silver insulation is to keep engine bay heat from heating up the air going into carb? Where and how is it terminated up front?

 

[bmbm40]

I’m building a 200 cubic inch.short block is a 1976 - 30 over-head is a 1979 big log competition type valve job and milled 60.. Howard’s 2800280 cam- stainless headers- pertronics distributor- . My question is which carburetor should I use- I don’t particularly like a Weber. I like the holley 350 2 barrel. But is it too big?? It’s a daily driver and I don’t want to mill and fill the intake- also I need info on where to purchase a nice billet adapter would like helpful comments- please don’t tell me I need an aluminum head or tons of machine shop work.

Looks like a nice build on your 200.