Thanks Ted. The carburetor is definitely the teapot/firebox. I'll order the kit for the Holly 4000 4V.



"What a waste of thumbs opposable, to build machines disposable." - A.D.

While that ‘H’ at the end of the part number is a logical assumption, it does not indicate ‘Holley’.  The ECZ-9510-H carburetor is indeed a Holley model 4000 four barrel and was original equipment on the 1956 Ford and Mercury 312 engines.  The Holley list number for that particular carb (located on the back flange) is also expected to read 1161-1A.  Other Holley model 4V carbs listed for the 1956 Merc 312’s includes the ECZ-A, ECZ-B, ECZ-G, ECZ-M, and ECZ-Q.  If the list number 1161 and the part number ECZ-H both match what you have, then get a kit for a Holley model 4000 4V.
 
Here’s a picture of the List #1161 Teapots.
  

Some of the 1956 Mercury engines also came equipped with a Carter WCFB carburetor.  Here’s the link to a previous thread giving some information on the 1956 WCFB carb.  See if the pictures of the carb within that past post more closely match what you have.  If so, then use carburetor part number ECZ-9510-F when ordering a carb kit.
http://forums.y-blocksforever.com/FindPost116555.aspx 

Here’s a picture of the 1956 Carter WCFB carbs.
 

Lorena, Texas (South of Waco)

The carburetor that came with the car is marked ECZ 9510 - H.
The "H" stands for Holly to my knowledge. When I look up the casting number ECZ 9510 for a rebuild kit, it brings me to the Holly 4000, and all components don't look like they will match up with the carburetor I have. Does anyone know what carburetor came stock with the 312? I don't want to order the wrong rebuild kit.

Yall have a good Sunday.

Zach

"What a waste of thumbs opposable, to build machines disposable." - A.D.

One of the things to keep in mind about 312s is the torque spec's for the Main Caps. If you take them apart for any reason. do not over tighten the main cap bolts!!. Unfortunately, some early 1956 manuals printed spec's that were far too high, this could resultl in stripped bolts or worse, a cracked block!  The 1957 manual states max 105lbs.  To be safe, the Street Rodder series years ago,recommended max 90 lbs.         


Paul

That's a 312.

Larry D

Winnipeg, MB Canada Eh!


'57 Fairlane 500 Club Victoria

'58 Custom 300 Tudor

'56 Crown Victoria

'61 Starliner Z Code

'51 Ford Victoria

The Main Caps read ECZ-6329-4

"What a waste of thumbs opposable, to build machines disposable." - A.D.

Sometimes when they set that long the valves stick . Easy enough since you already have the top end opened up to pull the valve covers and make sure that the valves will move.

Avoid bending some pushrods if the valves are sticking.

Welcome to Y Block world.
Oldmics

Heads and manifolds are interchangeable between 292 and 312 and will all have the same casting number depending on the year. The B intakes are about the best Ford made.

All the Casting marks I have found are labeled ECZ-B.

"What a waste of thumbs opposable, to build machines disposable." - A.D.

Thanks Lou. I don't want to miss certain details like that. As of now I have the intake manifold and carb off. Do yall think it's necessary to pull the heads off for a more detailed cleaning or should I just flush it and hope for the best?

"What a waste of thumbs opposable, to build machines disposable." - A.D.