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Canadian Poncho Homepage -> Canadian Poncho -> Beaumont Power Train Tech Forum -> Carb question...Carter 4028 vs Carter 9625
Post Info TOPIC: Carb question...Carter 4028 vs Carter 9625
03cts sport


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RE: Carb question...Carter 4028 vs Carter 9625
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Thanks again for the info Ian. I'll be looking for a 4028SA or 4028SB. Thanks muchly guys!

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Beaumont4008


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My chevy by the numbers book says that the four digit number is always followed by the S and sometimes SA and SB. There not sure what the S stands for but if it has the A it means the first level of engineering revision the B designates the secound  level of revision.


If your lucky and the carb still has its tringular metal ID tag still on it. The GM part number should be on it and under that the four digit carb number. Shows  4027 as GM 3876749 and 4028 as GM 3875966.



-- Edited by Beaumont4008 on Tuesday 21st of December 2010 12:48:25 AM

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03cts sport


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Beaumont4008 wrote:

 

The 4028 AVS carb was 575 CFM  .  The early AFB carb flowed around 500 CFM the secound design AFB was larger had a 5.5 in air cleaner base and flowed close to 600 CFM. The AVS used in 66 flowed around the same 575 to 600 CFM .  

CFM       Venturi Diameter            Bore Diameter
        primary    secondary       primary   secondary
--------------------------------------------------------
400	     1 1/8       1 1/4          1 7/16      1 7/16
500     1 3/16      1 1/4          1 7/16      1 11/16
575     1 1/4       1 9/16         1 9/16      1 11/16  (this is the size of the 66 4028)
625     1 3/16      1 9/16         1 7/16      1 11/16
750     1 7/16      1 9/16         1 11/16     1 11/16

Interesting info.  Thanks for sharing!  I do recall once the 9625 was installed that the car had to be in the higher RPM's before it would take off.  I guess this makes sense considering the larger size...

 



-- Edited by 03cts sport on Tuesday 21st of December 2010 12:39:02 AM

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03cts sport


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Any tips on what I should be looking for to ensure that I get the right 4028 AVS carb?

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03cts sport


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The "previous thread" I refered to was this one (in which many questions were answered):
 http://canadianponcho.activeboard.com/forum.spark?aBID=118110&p=3&topicID=33195077

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My chevy by the numbers says the same 4027 standard 4028 A/T used on passenger chevy II and chevelle in 66. A one year only thing for this carb.

-- Edited by Beaumont4008 on Tuesday 21st of December 2010 12:31:28 AM

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4SPEED427


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Saved me a basement run Ian! Thanks!

Actually, maybe I need it anyway!!!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars
Beaumont4008


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The 4028 AVS carb was 575 CFM  .  The early AFB carb flowed around 500 CFM the secound design AFB was larger had a 5.5 in air cleaner base and flowed close to 600 CFM. The AVS used in 66 flowed around the same 575 to 600 CFM .  

CFM       Venturi Diameter            Bore Diameter
        primary    secondary       primary   secondary
--------------------------------------------------------
400	     1 1/8       1 1/4          1 7/16      1 7/16
500     1 3/16      1 1/4          1 7/16      1 11/16
575     1 1/4       1 9/16         1 9/16      1 11/16  (this is the size of the 66 4028)
625     1 3/16      1 9/16         1 7/16      1 11/16
750     1 7/16      1 9/16         1 11/16     1 11/16


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4SPEED427


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I see it says 64-65 is AFB but nothing said for 66.

I will check downstairs in another book.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars
03cts sport


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Ahh, good point. It was a different number. I'm curious though as to what the number is (providing it's the original carb) and if it is indeed an AVS?...

4027 for the standard and 4028 for the PG (according to the book.  Interesting that in some areas they refer to them as 4027S and 4028S?)

-- Edited by 03cts sport on Tuesday 21st of December 2010 12:16:03 AM

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4SPEED427


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Is the manual trans carb the same number? I had it in my head it was different.

Never mind, the Beaumont parts book was right behind me on the table!

Manual trans 4027S, Powerglide 4028S

-- Edited by Carl Stevenson on Tuesday 21st of December 2010 12:10:56 AM

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars
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Thanks for the feedback Carl and Carl!
I'm glad you chimed in 65sssd. Out of curiousity, does your '66 327 SD have the original carb? If so, is it a Carter 4028?

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4SPEED427


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Seeing that you have a pretty unusual combo I would heartily endorse searching for the correct carb.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars
65sssd


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I would think the bigger one is the right one because the 275 HP is a overcarburated 250HP or so I am told.

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427carl


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yes!!    I had never seen a 327-275 with anything but a Quad..

I owned a 69 Z28 in 1979  I had bought it rolling, and put a almost new 79 350 in it  It had a Quad...  When i bought it back in 1984 it had a Carter on it off a Ford and it was a great carb...

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03cts sport


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Thanks for the feedback Carl. As I'm in need of a rebuild for my carb (the 9625 which replaced the factory 4028), I'm thinking that I should probably source a rebuilt 4028. Would you agree with this rationale?...

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427carl


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looks like the 4028 is around 500cfm and 9625 is 625 cfm   On a stock or close to stock, both would work well...   My 427 runs a 650 Holley and doen't run out of fuel until 150mph.

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427carl


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Since the 4028 is less than 1/2 of 9625, the smaller carb probably works 1/2 as well... confuse

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03cts sport


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Per the feedback in a previous thread, it seems like the consensus is that the Carter 4028 AVS was likely the original carb for a '66 Beaumont 275hp 327.  As I know nothing about carb's, my question is...
Any thoughts on how the performance of the Carter 4028 would compare to that of a Carter 9625?
Feedback is appreciated.
thx
gw

-- Edited by 03cts sport on Monday 20th of December 2010 07:35:52 PM

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"So when you spot violence, or bigotry, or intolerance or fear or just garden-variety hatred or ignorance, just look it in the eye and think... The good outnumber you, and we always will."  Patton Oswalt
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