Holley carb cfm identification

I have a holley 4150 carb that the choke horn has been milled off and I need to determine the cfm. Internet searches haven't given me anything yet. On the top of the body is stamped 6R 5534.
How can I identify the carb since the choke horn is gone? Measure the throttle blades? Anyone know where to find that information?

Thanks
Scott

 

I think you can google it or go directly to the holley web page. I have a 4150 as well and that's how I got the info I need. Also, you can call Holley. They were very helpful since I had to get a rebuild kit.

 

There is nothing to google as the choke horn is gone.

 

Could you post a couple of close-up pics??? One of the bottom and one of the top?? I could give you a rough idea of the cfm flow rating on it.

 

sure I'll take some tomorrow. Anyway i can measure the venturi diameter or throttle blades?

 

Sure!!! That be cool. Check the throttle plate dia. I have a bunch of these laying around and I also rebuild them for folks around here. I just rebuilt one for a guy last Sep that owns a '69 440 Runner. He's a happy camper.

 

The venturi and boosters are where it's at. I've noticed several different size Holley's running the same baseplate.

 

The most common thottle plate diameters on Holleys are 1.500" 1-9/16'" 1-11/16's and the bigger ones... 1-3/4" like the 850 cfm.

 

Tell us the type of booster, diameter of the venturies , diameter of the throttle blades. That will get very close.

 

Let's see.... There's the 1-3/8" venturi with the straight leg booster and the 1-11/16's" throttle bores which is a 750 cfm. You guys want me to start shootin' out some List # ???

 

I've got 2 rare ones I've been sitting on. One is List-4557 and the other, a List-4223. Anyone know what those are??

 

If the boosters (they project into the venturii, fuel comes out of them) come straight out then it is likely a 650cfm carb; if the boosters step down and the throttle blades are #172, then its likely a 750 cfm; if the baldes are #180 it'll be an 850 cfm. The blade numbers can be read on the bottom, the numbers'll be on each blade and facing each other on the inside (hard to explain, the blades have a direction and an angle is cut into them. When you put the blades in from the top side you look at the blade number, turn it upside down - it'll face the bottom - and turn it so that the number is closest the middle of the carb. When upside down you can read the numbers and they are 'inside' the throttle shaft). Damn, i hope you can make sense out of that. In recent years holly changed cfm rating by mixing these blades or making them thicker, so a carb with one set of #172 and the secondary blades a different number but thicker then it'll be a 700 cfm. Ok?

 

<table cellpadding="0" cellspacing="0"><tbody><tr><td width="95" valign="top"> R-4223AAS
</td> <td width="91" valign="top"> 4150-C
</td> <td width="218" valign="top"> Edelbrock Hi-Perf., 427 Eng., 850 CFM
</td></tr></tbody></table>
<table cellpadding="0" cellspacing="0"><tbody><tr><td width="95" valign="top"> R-4557A
</td> <td width="91" valign="top"> 4150
</td> <td width="218" valign="top"> 1970 Camaro & Chevelle N/W, 396 Eng.
</td></tr></tbody></table>From here. http://www.tocmp.com/manuals/Carbs/Holley/MasterList/index31.html

 

One of the Holley carbs I have, has 1-9/16" primaries and 1-11/16" secondaries on a standard flange throttle plate. Seems to me this carb would flow about 725-735 cfm. After looking up the list number, I believe it came on a full size Mopar in '69 er '70.....

 

Your almost right on what those carbs are for.. The 4557 is for a 1970 LS-6 454 Chevelle motor w/4-speed and emissions. The R-4223 is a ultra rare "Center Squirter" 850 cfm carb that came in big trucks. You still win a cookie!

 

By the way....... Thanks for posting the complete list. Hope it helps out everybody that has a Holley 4V carb. I saved it in my favs.. Thanks again!

 

No problem. I always wondered about the accuracy of that site. Been very good for my Ford carbs.

 

The Holley Carburetor Numerical Listing supplement that I have from the 70's also lists the R-4223AAS as Edelbrock Hi-Perf, 427 Eng. 850 CFM
R-4557A as 1970 Camaro & Chevelle N/W 396 Eng. Std. Trans, Emission

The R-4558A is for the 1970 Corvette Calif. 454/465 HP Auto. Trans. (with D.P) 850 cfm.
Larry T

 

There's also a vin # just above the List number on the choke horn of that carb. I'll have to cross ref. both numbers and check it out. I know the carb is a 780 cfm w/vacuum secondaries and also a second metering block with no idle screws.

 

VIN for the 4557 should be 3967477.
Larry T

 

Correct!! with a GG or a GD on the end of that vin.... I'll find out tomorrow. I'm sure it's an LS-6 carb.

 

the venturi measured 5/8". Sorry no picture yet take some and post them up. It is a 4150 with 4 corner idle.

 

If the date code on the 4557 is correct for 1970 it can triple its value if not more. however it will also have to include the correct part number and letter designation.I had a Holley for a 65 Z16 but it was a later replacement carb and therefore dropped its value considerably....

 

That book might say that the R-4223AAS as Edelbrock Hi-Perf, 427 Eng. 850 CFM but the Holley List-4223s is a 850 center squirter carb. I have a pair of these I was thinking about moving that are both dated within 1 month of each other. I have a set of Holley List-4224 that I will run instead. Mark

 

Cool!! Can you post some close-up pictures of those carbs please??? Mine's all in pieces in box and buried in the garage.. Thanks a bunch!!

 

bttt............

 

Which pair of carbs do you want to see, the 660's or 850's? The 660's have been restored with 850 base plates and are on my tunnel ram, the 850's are stock and I think I might keep them for my future 540 BBC purchase. But you never know...

 

The 4223 850's... If ya ever want to get rid of those, please feel free to give me a buzz on here...

 

Here you go!!.... Third week in January of 1970..

 

Hope I got that manufacturing date correct...