Holley 1904 Carburetor

Smitty

Smitty

Well-known member
Hi All,
Anyone have experience with Holley 1904 carb? Tried one on my H-226 flat 6, ran incredible then flooded out.



Thanks, Steve
 
Check needle valve. The original steel needle was probably replaced with a rubber-tipped needle at some point.
 
I found the gasket that came with this NOS unit did not fit correctly and allowed a slight vacuum leak. I made a new correct size gasket and problem solved. My only issue now id no place to connect distributor vacuum line.
Runs great now.
 
Smitty said:
I found the gasket that came with this NOS unit did not fit correctly and allowed a slight vacuum leak. I made a new correct size gasket and problem solved. My only issue now id no place to connect distributor vacuum line.
Runs great now.
Click to expand...

I don't understand how it ran great for while then flooded out, and a vacuum leak was the cause ?
Also, a 1904 Holley for a Ford 6 cyl. should have a vacuum port for the loadomatic distributor about halfway up the carb,

Sal
 
International Harvesters used the 1904 as well, but can’t recall if they had the vacuum port as Sal mentioned. If your 1904 is from a Ford, it should have a Ford list #.
 
I run a 1904 on the 215 six in my 53 sedan since that is what the factory installed and it clears the hood. It works decently, but is not a better design carburetor than the Holley 847 in my opinion.
As 1952henry stated he Ford installed 1904 carburetors have a vacuum port with the correct signal for the stock vacuum only distributor.
 
I have had numerous Holley 847 carbs on my H-226 with no luck. All of mine tend to sweat gas and stumble badly on acceleration. Need to bring rpm up to drive away. Accelerator pump drizzles gas, not a spray like on the 1904. I have had several with a couple having been rebuilt. Cannot make any of them work well...
 
I have the 1904 on 3 different International sixes. One of them runs ok but no matter what I try on the others I can't get them to idle or run smooth under a thousand or more rpm. At full throttle they pull like crazy but take my foot off the gas and they want to die. They have a vacum port somewhere up on the side of the carb that goes to the distributor advance.
 
Interesting..my 1904 is a new old stock. Runs great at all rpm. Perhaps there is a difference in samples..
 
It can be tough to find a 1904 in useable shape these days. The front bowl screws are often stripped out from over tightening. The throttle shaft opening can have wear that leads to vacuum leaks. I had to buy a couple used ones for my 53 Customline w/215 before I found one that was in good enough shape to rebuild and be useable.
 
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