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Old 08-17-2019, 03:52 PM   #1
Dick's Hot Rod Place
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Default Holley 1273-2S carburetor

I have recently acquired a pair of Holley List 1273-2S carburetors. The research I have done tells me it was the first new style carb for the "57 T Bird. What I can't seem to find is what the CFM of these carbs were. I have done a lot of digging and have found 390, 410, 425. And I know the replacement is 465. These are original Ford, not replacements. Does anyone know for sure what they are?
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Old 08-17-2019, 08:04 PM   #2
paul2748
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Default Re: Holley 1273-2S carburetor

I think the original carbs were 435 CFM
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Old 08-18-2019, 06:23 AM   #3
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Post Re: Holley 1273-2S carburetor

Rated @ 465CFM.

Is there a FORD ID STAMPING NO. next to the HOLLEY LIST NO.?
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Old 08-18-2019, 08:12 AM   #4
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Default Re: Holley 1273-2S carburetor

the ford 4100 was 410 but i have no idea about the holley
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Old 08-18-2019, 08:20 AM   #5
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Default Re: Holley 1273-2S carburetor

My info has the Ford 4100 w/ 1.08 venturis at 480 cfm. The 1.12 4100 used typically on 390 engines is rated 600 cfm
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Old 08-18-2019, 09:30 AM   #6
darrell
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Default Re: Holley 1273-2S carburetor

some 289s were 480 the 312 was 410.y block magazine from years ago.they should know.
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Old 08-18-2019, 11:40 AM   #7
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Default Re: Holley 1273-2S carburetor

The 1273-2S is a service replacement for the original 1273 and 1273-1 that were used on '57 312's. They were built after the '57 production run and after the 1273-1's ran out of stock. Not quite as valuable as an original '57 run 1273, but I'm sure is still considered correct for a judged show car. There are also minor outside appearance differences like the arced slot in the secondary throttle lever instead of the original straight slot. Also the bowls had thicker reinforcement to prevent warpage after installing them.


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Old 08-18-2019, 01:13 PM   #8
darrell
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Default Re: Holley 1273-2S carburetor

digging through my old stash of y block mags a fellow with a 57 holley worked for the local holley distributor in washington dc.he rebuilt his and said it was 410 which makes sense.
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Old 08-28-2019, 01:33 PM   #9
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Default Re: Holley 1273-2S carburetor

A little off topic but, I have a 4100 with 1.14 venturi's. Does anyone know the CFM rating for it?

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Old 08-28-2019, 05:19 PM   #10
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Default Re: Holley 1273-2S carburetor

Quote:
Originally Posted by frnkeore View Post
A little off topic but, I have a 4100 with 1.14 venturi's. Does anyone know the CFM rating for it?

Frank
This link shows the CFM ratiings for the different venture sizes. For the 4100, they don't show a 1.14 venture, but show a 1.19 which was rated at 670 CFM.


Sal


http://mustangtek.com/carburetors/FordCarburetors.htm
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Old 08-29-2019, 05:58 PM   #11
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Default Re: Holley 1273-2S carburetor

Sal,
Thank you, I went back and looked at my stash and I was mistaken. All 4 of mine are 1.12. I have a 5th one that is marked ECZ, with smaller throttle bores, it's probably the 450 cfm. I do have one 2100, 1.14 and must have confused it with one of the 4 barrels.

Again, thanks,

Frank
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Old 08-29-2019, 07:01 PM   #12
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Default Re: Holley 1273-2S carburetor

Frank, the ECZ 4100 you have should also be for a '57 312 Ford. Don't think the T-Bird ever got a 4100 installed on the assembly line.


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Old 08-29-2019, 07:12 PM   #13
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Default Re: Holley 1273-2S carburetor

Thank you again.

The throttle plates are stuck on that one. I'll have to see if I can fix it, it might be a good one to try on a 302.

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