Need help holley 1904

I would say the best to probably do is keep the original vacuum spark valve carbs, or Loadomatic carbs that do not have a spark valve. Then modify them for ported vacuum (eliminate venturi vacuum). Then use a later distributor with centrifugal and vacuum advance. The engine would still look original except for an expert looking closely. Plus it would have optimum performance. Consistent anyway.

Sal
 
Thanks a lot for the replies, they've been very helpful. Jimz Birds don't worry about stealing the tread, your inputs are a very good read and educational.

As for my car, I just reinstalled the Edsel carb with a few modifications, basically built one from both and the car seems to be responding pretty well. I have a little more work to do on it before it's drivable but at least it now starts and idles on it's own. I may have a slight issue with a valve not closing all the way (no blowby noticed) but otherwise it sounds pretty good.

Thanks again, I'll keep you posted on any new discoveries!
 
Good to hear you are making progress.
That is half the "fun" of these old cars.
And I do, at times, get a bit wordy. ;)
Glad it was somewhat helpful.
 
Great info here. Helpfull to me.
My 223 six has a Holley 1904, without a scv and I doubt very much that somebody ever changed the original setup. I also have that unused manifold port, my vac line also attaches to mid Holley.
Not to confuse the thread but does electronic ignition need vac advance?
 
RCM said:
Great info here. Helpfull to me.
My 223 six has a Holley 1904, without a scv
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Some LoadO carbs use a distributor check ball to blend the differential vacuum between the upper and lower distributor vacuum ports. They do not have a SCV.
You still have one port at the top and another down at the throttle plate which has the distributor check ball in between them which goes up and down to help regulate the vacuum advance.
The distributor check ball performs pretty much the same function as the SPV. It blends the venturi vacuum and the throttle plate vacuum to regulate the dizzy advance.
At least that is how it is supposed to work. Sometimes sticky balls can be a problem. (apologies to Andrew Dice Clay if I stole one of his lines from when he was Ford Fairlane.)
 
Jimz Bird said:
Some LoadO carbs use a distributor check ball to blend the differential vacuum between the upper and lower distributor vacuum ports. They do not have a SCV.
You still have one port at the top and another down at the throttle plate which has the distributor check ball in between them which goes up and down to help regulate the vacuum advance.
The distributor check ball performs pretty much the same function as the SPV. It blends the venturi vacuum and the throttle plate vacuum to regulate the dizzy advance.
At least that is how it is supposed to work. Sometimes sticky balls can be a problem. (apologies to Andrew Dice Clay if I stole one of his lines from when he was Ford Fairlane.)
Click to expand...


This info is new to me, what books would I get to read about this?
 
oj said:
This info is new to me, what books would I get to read about this?
Click to expand...
We are still on topic as we are still discussing the carb and dizzy questions the OP asked about.:D
This is from Pg 2-13 of the 1957 Ford Shop Manual on 6 cyl dizzy overhaul.
As a bit of a disclaimer, I have never worked on a 1904. This is the only info I have. I don't want it to appear that I am arguing with anyone.
Perhaps the SCV is a different Holley List # as a remedy to sticky balls. That is a guess.

15923582071_d5b3466948_s.jpgPg 2-13 6 cyl dizzy ohaul by jimzbrd, on Flickr
 
Okay now I understand the origin of the combination ported and venturi vacuum. Obviously, my Holley 1904 has the small tubing from the carb to the distributor vac advance, but it also does have the a port in the main body of the carb with the ball check valve which does mate with the hole thru the valve body.
Heres the confusing part; both the SCV and non-SCV valve body's have that same mating hole that connects with the ball check hole in the main body. And both main body's have the hole for the ball check valve. So it appears both SCV and non-SCV carbs had ported and venturi vacuum.
 
Daves55Sedan said:
Okay now I understand the origin of the combination ported and venturi vacuum. Obviously, my Holley 1904 has the small tubing from the carb to the distributor vac advance, but it also does have the a port in the main body of the carb with the ball check valve which does mate with the hole thru the valve body.
Heres the confusing part; both the SCV and non-SCV valve body's have that same mating hole that connects with the ball check hole in the main body. And both main body's have the hole for the ball check valve. So it appears both SCV and non-SCV carbs had ported and venturi vacuum.
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Yes, all carburetors for Loadomatic systems used ported and venturi vacuum combined whether they were SCV or non SCV. 1, 2 and 4 barrels.

Sal
 
my55customline said:
HI I,M NEW HERE I HAVE 55 FORD CUSTOMLINE WITH A 223 MOTOR I WHAT TO KNOW WHAT CARBURETOR IS USED I UNDERSTAND IT USE HOLLEY 1904 BUT I CONFUSE WITH THE CARBURETOR BECAUSE I SEE WITH SPARK CONTROL VALVE AND NONE SPARK CONTROL VALVE:confused: I NEED HELP THANK
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Look for the list no. it is on the flat of the fuel inlet boss.
Your 55 should have these nos if standard trans.: 800 or 1241
Automatics had No 826.
this info is from a 1962 Holley document i found on line.


Daves55Sedan said:
Now I need to ask this... there are two vac ports on the '55, 223 intake manifold; one is for windshield wiper connection and the un-used port is plugged (appears to have always been). Where should that un-used port be piped to if I am using Holley 1904 without SCV? Currently the carb has tubing routed to dist vac diaphragm. Is there supposed to be a "tee" in that line???
Currently, my Holley 1904 is converted with a valve body that has SCV. The engine was very sluggish upon accelleration after climbing to normal operating temperature. I had been given to believe that I had the wrong carb (by several sources) and that I needed the one that included the SCV.
I have been doing some other work to the Courier so I have not started this thing up and tested it yet. Now I am wondering from all I have read here, it may be okay to leave the carb with the SCV, but what about the manifold vacuum. (currently, there is only ported vacuum)?
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The LOM uses only ported vac from the carb. plug the manifold vac unless you need it for the wipers.
Check the condition of the advance diaphragm. If it leaks it will never run right. The correct carb for '55 does not have the SCV, just a port on the side of the carb.
 
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