The Ford Barn

Bob P. · 03-08-2011, 01:12 PM

Hi can anyone tell me if a Zenith carb for a model B flat head will work on a model A flat head? Can you tell me if I will need to change anything to make it run right? Is there any advantage with the model B carb. I picked up one for the right price and it looks like it might fit on the Model A, I just don't know why Ford would have changed the look of the Model A Zenith carb for the 32-34 flathead?

Dave in MN · 03-08-2011, 02:08 PM

It will work fine without any modifications.....but the B carb has the ability to deliver more fuel/air mixture to the engine at higher rpm. To fully take advantage of the extra capacity of the B, you may want to consider boring out your A intake manifold. I have a series of pictures that show the process to "Do it Yourself" on my website. (Link below.)
Look on the Services page near the bottom for a link.
Good Day!
Dave in MN
www.durableperformance.net

Charlie Stephens · 03-08-2011, 02:20 PM

In addition to Dave's comment you might cosider replacing your Model A intake with a Model B intake. The early Model B intakes had a provision for the vacuum line at the front but the later ones look a little better on the Model A.

Charlie Stephens

rollingsculpture · 03-09-2011, 11:17 PM

i thought the model B manifold has the B carb slightly turned at an angle and the gav linkage would not connect correctly

Ray in La Mesa · 03-10-2011, 12:20 AM

There is a slight misalignment with the "B" carb on an "A" manifold. One way to correct it is to oval the bolt holes in the manifold to allow the carb to rotate enough to align the GAV. Another is to grind off the bolt threads right under the bolt heads to allow the rotation.

vtwinsideways · 03-10-2011, 01:03 AM

Sponsored Links (Register now to hide all advertisements)

Love the B carb on my A. Puts a little extra pep in my step! Luke

2manycars · 03-10-2011, 07:15 AM

You will need to make your own fuel line, as the inlet is in a different location. Be sure to make it so there is a constant downward slope, with no level place, so as to prevent vapor lock. (experience talking)

vtwinsideways · 03-10-2011, 08:57 AM

If you do make your own fuel line, make sure you use the lightest walled line you can find, as some commonly used, hardware-store copper line can restrict fuel flow. Luke

03-08-2011, 01:12 PM	#1
Bob P. Junior Member Join Date: Jul 2010 Location: Oregon Posts: 20	Model B carb to use on Model A ? Hi can anyone tell me if a Zenith carb for a model B flat head will work on a model A flat head? Can you tell me if I will need to change anything to make it run right? Is there any advantage with the model B carb. I picked up one for the right price and it looks like it might fit on the Model A, I just don't know why Ford would have changed the look of the Model A Zenith carb for the 32-34 flathead?

03-08-2011, 02:08 PM	#2
Dave in MN Senior Member Join Date: May 2010 Location: Jordan, MN Posts: 1,411	Re: Model B carb to use on Model A ? It will work fine without any modifications.....but the B carb has the ability to deliver more fuel/air mixture to the engine at higher rpm. To fully take advantage of the extra capacity of the B, you may want to consider boring out your A intake manifold. I have a series of pictures that show the process to "Do it Yourself" on my website. (Link below.) Look on the Services page near the bottom for a link. Good Day! Dave in MN www.durableperformance.net Last edited by Dave in MN; 03-08-2011 at 03:04 PM.

03-08-2011, 02:20 PM	#3
Charlie Stephens Senior Member Join Date: May 2010 Location: Southern California Posts: 7,052	Re: Model B carb to use on Model A ? In addition to Dave's comment you might cosider replacing your Model A intake with a Model B intake. The early Model B intakes had a provision for the vacuum line at the front but the later ones look a little better on the Model A. Charlie Stephens

03-09-2011, 11:17 PM	#4
rollingsculpture Senior Member Join Date: May 2010 Location: Takoma park md Posts: 271	Re: Model B carb to use on Model A ? i thought the model B manifold has the B carb slightly turned at an angle and the gav linkage would not connect correctly __________________ Rust and roll will never die

03-10-2011, 12:20 AM	#5
Ray in La Mesa Senior Member Join Date: May 2010 Location: La Mesa Ca Posts: 1,172	Re: Model B carb to use on Model A ? There is a slight misalignment with the "B" carb on an "A" manifold. One way to correct it is to oval the bolt holes in the manifold to allow the carb to rotate enough to align the GAV. Another is to grind off the bolt threads right under the bolt heads to allow the rotation.

03-10-2011, 01:03 AM	#6
vtwinsideways Senior Member Join Date: Jun 2010 Location: T(r)aylorville IL Posts: 150	Re: Model B carb to use on Model A ? Sponsored Links (Register now to hide all advertisements) Love the B carb on my A. Puts a little extra pep in my step! Luke __________________ I get all my excercise jumping to conclusions! http://www.newporthillclimb.com/

03-10-2011, 07:15 AM	#7
2manycars Senior Member Join Date: May 2010 Location: Eastern CT Posts: 2,732	Re: Model B carb to use on Model A ? You will need to make your own fuel line, as the inlet is in a different location. Be sure to make it so there is a constant downward slope, with no level place, so as to prevent vapor lock. (experience talking)

03-10-2011, 08:57 AM	#8
vtwinsideways Senior Member Join Date: Jun 2010 Location: T(r)aylorville IL Posts: 150	Re: Model B carb to use on Model A ? If you do make your own fuel line, make sure you use the lightest walled line you can find, as some commonly used, hardware-store copper line can restrict fuel flow. Luke __________________ I get all my excercise jumping to conclusions! http://www.newporthillclimb.com/