Holley jets


http://209.208.111.198/Topic82288.aspx 		Print Topic | Close Window

By PWH42 - 12 Years Ago
Anyone know what jets were original in 57 T-Bird Holley?I bought one a while back and discovered there are no jets in it.Also,it has a 105 power valve in the primary.Is this correct?
By DryLakesRacer - 12 Years Ago
The 105 power valve means it's going to open and start letting more fuel at 10.5 inches of vacuum. I personally like them lower mabe an 85 or a 95. (little better fuel economy)If your a flat lander 105 is probably a safe place to start. They are available down to a 45 I believe.

The Holley 585 CFM had 62's in the primarys and 64's in the secondarys and I believe that was the one on the first Fords but I could be wrong on that. If it is a 650 they were slightly larger. Check the # on the right side of the choke horn for the model of the carb and go from there. Good luck
By NoShortcuts - 12 Years Ago
Hi Paul,

I'm guessing that you've got a 'D' code 'Bird with a 312... 'C' 'birds had 292s with a two barrel and aren't that common...

Original equipment per the '49-'59 Ford Text Catalog shows air horn I.D. numbers of:

ECZ-V or ECZ-Y [Fordomatic]; ECZ-AC or ECZ-AD [Fordomatic]; and B7AE 9510-A [no trans listed]

There's got to be something different about the three sets of numbers I've listed because the parts list breakdowns are in three separate listings.

That said, for your elevation of ~660 feet, all three carburetor listings show:

no. 55 primary jets and no. 48 secondary jets for 0 to 5,000 feet

Two 'economizers' are shown - (1) stamped No. 85, (1) stamped No. 105 (secondary)

'57 'D' 'Birds used the 4150 Holley which had metering blocks on both the primary and the secondary sides. While the parts book does not list the 85 as a 'primary' economizer valve, but does list the 105 as the economizer valve 'secondary', I believe each metering block has an 'economizer' valve. -Unfortunately, I could not verify this in the '49-'59 Ford Illustration Catalog parts blow-up picture.

Hope this helps. Smile
By DryLakesRacer - 12 Years Ago
Sorry for the brain fart. Been using Holleys without jetplates for a long time and forgot. From the info I've got ECZ, should be on the choke housing and 1272 or 1273 behind the "list" I believe the 1272 was early 1957. I'm going to ask a friend tomorrow for the jets size for the front and the # for the proper jetplate. He is a retired community college Auto Shop teach who kept all the technical books on carbs...he has helped out a ton on Carter and Rochester jets and metering rods. I did open one of my 585's and found #58 jets. It has 109 plates on the bottom butterflies. What is on yours?

Looking at the top of a 57 Ford Holley they have a pretty small venturi. I have a 2 barrel Holley which has that same venturi and it comes with #52 jet as stock. It flows 280 CFM and has a 107 on the butterflies..................JD
By pegleg - 12 Years Ago
I'm no longer sure of the actual sizes, but I do remember the primaries are larger than the secondaries in those carbs, and take the larger jets (in the primary side.) 55/48 sounds about right, but please don't take my word for this.
By Ted - 12 Years Ago

Prior information appears to be correct. By the book, #55 jets in the primaries and #48 jets in the secondaries for the List #1273 Holley. The Holley specification manual also shows #85 power valve for the primaries and #105 for the secondaries.

Power valves are available down to a 1.0” Hg opening (#10) but I use a majority of #25 (2.5” Hg) and #35 (3.5”Hg) power valves in performance applications. Most street applications are happy with a #65 to #85 power valve in the primary side of the carb. Much of the power valve selection process depends upon the camshaft profile and the drivers particular driving habits.
By PWH42 - 12 Years Ago
Thanks everyone for the help.You've affirmed what my thinking was on this.It's been too many years since I worked on a Holley.55 and 48 jets and 85 and 105 power valves it will be,at least for a start.