I've noticed from some on line pics of Holley 94 carb's, that some spray bars are taller than for some model's. Can someone please tell me which carb model's use the high spray bars? Or where I could find this info online? Thanks.

 

I assume you are talking about the main nozzle bars? There was a change in the Y-block type carbs to a different style, but the upper bowl cover had a corresponding change to clear them. They are called annular discharge type.

Or are you talking about accel pump spray nozzles?

Here are an early 94 nozzle bar and the later 2110 annular nozzle

 

Like the one in the left pic you posted. Now is this an accel pump spray nozzle (bar)? Here's a pic of what I saw (by the red lines).


So in what years was this change effective? Thanks.

 

The items you are pointing to are the main nozzle bars, that is where gas from the idle circuit and the main jet comes out.

Here is the accelerator pump nozzle:

 

That cut away view you sent earlier was really helpful. So I'm assuming the Y block change that created the higher spray nozzles took place from about the year '52 and up?
Now for my bigger problem. The 7RT that I said I was working on in an earlier post, today I started to install the choke shaft. Big surprise! The two shaft holes in the air horn body are not true to one another. If I slide the shaft in one hole, it would not slide into the other hole. So I measured the warp or wobble on the shaft using a dial indicator set up, and it's as true as can be. The hole it doesn't go into is about 3/32" off. And this is the shaft that came out of the carb. Any thoughts here?

 

BTW, how do you ever get to 10K+ posts

 

Been here a long time, and basically have no other life I guess!

To be clear on the main nozzles, the old style stick up like you see in the picture, the newer style doesn't stick up in the center of the bore, but over at the edges where the clamps are they are taller and (I think) fatter). You can put the newer style in an older carb, they'll physically fit in the bowl section, but the older style air horn section won't sit over them.

The Y-block style 2110's I am familiar with are ~ '56 or so. They have 1-1/16" venturis compared to the 94's 15/16ths bores. Doesn't sound like much but it's about 30% more flow area.

As far as the choke shaft, the air horn must be distorted. I'm surprised it's that far off, that is an awful lot. I can't think how it could be unless the carb was dropped or something?? Can you force the shaft thru?

 

Here is a pic showing the shaft mis-alignment. I can flex the shaft to start into the hole but it IS very tight. I do remember it was very difficult removing the choke plate AND I had to tap the shaft out. AND just today on eBay, I found a replacement top with float, choke shaft/plate and choke linkage...ready for this....$.99 + $12.00 shipping. Now how is that for luck!!

 

The right angle- shaped pieces came into being in late 51, I believe. The ones pictured, with the roll pin, came on the y-blocks.

 

I am aware of 3 different spray nozzle designs.

The 38-49 carburetors had the "tall" spray nozzle that angled up to the center of the bore, then back down to the other side.

The 50-55? carburetors had the "down angle" spray nozzle that is taller on the fuel bowl side and angles down across the bore. The top had to be changed to allow more room for the tall side of these nozzles. I have seen these both with and without the small rolled cross bar.

The 56 carburetors had the "annular" spray nozzles. The carburetors these came out of also have a larger venturi bore, and usually have automatic choke.

All three can be used in any Holley 94 style carburetor if a top allowing the correct clearance is used.