Ted or anybody- can you tell me what the numbers on the metering blocks should be on a 1957 thunderbird 4 barrel Holly list 1273-1 ecz AD? And is their any documentation? where would I find this? I am in somewhat of dispute with a person I purchased a carb from. This carb has primary 1832 secondary 1774. Are these the number Holly used for this  card?  Thanks

The date code on the ’57 Holley is found on the front of the choke air horn and will be a 3 digit number.  First number is the year, second number is the month, and third number is the week.  November and December designations use A & B respectively instead of numbers.   Ie. ‘6A5’ would be 1956, November, & fifth week while ‘711’ would be 1957, January, & first week.  These two datecode numbers came off of a pair of 1273 carbs I have.

 

---

Per the ’57 Ford parts catalogue:

The Holley 4V carbs were factory installed on 1957 Ford cars and Thunderbirds with the 312.  The Ford number on the carb is ECZ-AC, ECZ-AD, ECZ-V, or ECZ-Y.

 

The Ford (Autolite style) 4V carbs were on 1957 Ford cars with the 312.  The Ford number on the carb is ECZ-U or ECZ-Z.

 

The Carter 4V carbs were on 1957 Ford cars with the 312.  The Ford number on the carb is ECZ-AA.

---

My own experience mirrors that of John and the others in that the 1957 Thunderbirds with a single four carb came only with the Holley carb but any of the three 4V carbs that were available could be on the the 312 equipped Ford cars.  Recent dyno testing of the three original carbs restored back to factory specs while on a stock intake shows the Ford carb to have a slight edge over the Holley while the Carter 4V carb lagged significantly behind the other two.  Issue #97 of the YBM will have an article that goes into detail on sixteen different 4V carbs that were run on a stock intake on the 312 dyno mule with stock G heads.

Lorena, Texas (South of Waco)

Well it looks like I have a 312 carb.

Butchering up everything I can get my hands on in Dayton Ohio

The number is on the front of the air horn, where the butterfly for the choke is and on your right side lokking at the carb. This carb was only used on 57 Birds and had ECZ-A,V,AC,or AD. The List number is under that either 1272 0r 1273 with 1584 primary metering block and 1589 secondary block. If the numbers ain't there, it ain't a 57 Holley. 

Bud in Northern Arizona on route 66 in Winslow (standin' on the corner)

If you're American, buy American

631/2 Galaxie 500XL 406   55 T-Bird

If you look in the Ford shop manuel for 1957 it covers 3 different makes of carbs, and also covers 2 barrel and 4 barrel for those 3 different makes, the carb that junk yard has is what the manuel calls a Ford carb which is a autolite. Now can anybody tell me on the tbird holley where is the date code? is it a 3 number set and how do you read them, (not asking alot)

My 57 D code I bought new had a Ford carb, I guess that was the Autolite?

Paul J. - '57 E Code

'57 312s could have had a Holley, Carter AFB, or Autolite carb.  T-Bird 312s all had Holleys.

John - "The Hoosier Hurricane"

ECZ was a Holley 4 Barrel used by the 312 in 1957. 292 no longer offered a 4 barrel in 1957.

Kenneth

Fredricksburg, Texas

I have this motorcraft looking 4 bbl that has ECZ cast in the side that most likely came off a friends dads 57 but not sure if it was a 312 or a 292,of course it does not have a tag and from what I have read here that the 312s had a holley and I think the 57 I had years ago that supposively had a 312 also had a holley so was there a 292 4 bbl motor and what carb did it have .

Butchering up everything I can get my hands on in Dayton Ohio