Help Identifying a Holley?

[PbSLED]

I can't seem to find out much of anything about this Holley carb. I bought it several years ago as a "temp" replacement for a Q-Jet on a Nailhead but it has worked great for year, but now needs a kit and I am wondering if it is worth the $ to invest into it. It does have the single piece casting bowl which is unique but now evidentally discontinued.
I bought it from Summit and I think is a 650 Spread-bore and perhaps modeled of the older Economaster but evidentally the three piece casting never caught on.

Any ideas or details would be helpful...

(see pic)

[Madcat455]

If you can get the List# off of the carb, you I can look it up and see what it is. Holley has a tech page where you can look up List #'s.

[tommieboy]

Holley 4011 series.

http://www.holley.com/HiOctn/TechServ/TechInfo/f4011.html

http://www.holley.com/HiOctn/TechServ/TechInfo/4011.html

[Madcat455]

4011's came in 650 & 800 CFM.... List# would help find specifics on it.

Here is the holly List page... (list carbs by List#'s with spec's on them) :TU: :TU:


http://www.holley.com/HiOctn/ProdLine/CarbList.pdf


HTH

[tommieboy]

I think it's an old Ford Autolite 4100 carb design. Also came standard with an annular discharge system that Holley adopted on their performance carbs. I've been told that the transition from the primary to secondary system was much smoother than the Quadrajet. I never had a chance to verify this

Here is a square bore version of the Autolite 4100 showing the annular discharge system:

http://www.mustangandfords.com/mustangfords/techarticles/p98889_image_large.jpg

[PbSLED]

With your help I was able to get the renew kit number and look up a few things. Any thoughts on this carb (650cmf) in particular? Has anybody ever used / tuned one ?

How would it compare to a well tuned Q-Jet ? (750)

[PbSLED]

typo cfm...

Also, the engine it is not going on back the nailhead.... don't shoot me. It is going on a ZZ4 Chevy 350.

.... its a long story, but I am more of a Q-jet fan than Holley.