Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

Cant seem to nail down exactly what this thing is, I'd like to verify the cfm? It has no choke and mechanical secondary's. I'm building a solid lifter 439ci (.060" over 427) BBC motor with a Clay Smith solid 304 cam, 258 duration @ .050" .615" lift. With a Weiand 7620 single plane intake. I'll post pics directly...Thanks, ;)

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

How about calling them?

https://www.customcarbs.com/

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

Might do that Monday...This carb came with a 69 L34 396 I bought a few years ago.

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

You can also measure the diameter of the butterflies and get a good idea by comparing them to the size of specific known CFM carbs. I have a Holley book with all the butterfly sizes.

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

They're 1-11/16" diameter...I found Carb Shop's Facebook page and oddly enough they responded right back indicating that it is a 750 CFM carb. The carb has been on the shelf for years so I'll go through it and check the pump diaframs and jet sizes, etc. I don't think that cam will be making much vacuum so power valve rating will be a concern as well. This is my first Holley carb so everything is a learning experience. Any and all help is greatly appreciated, thanks! 👍🇺🇸

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

I looked in my Holley book and it seems that with the double pumpers, the 1-11/16" throttle bore is used from 650cfm thru 800cfm. The flow difference is determined by the venturi diameter. A 750 should have a venturi diameter of 1-3/8".

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

Captain Fab, what holley book do you have that has that info? Looking for a way to ID 850 CFM carbs, as I need one and it seems no one near me know actually what they have and most can't read the #'s

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

It is the Holley performance catalog from 1998. I have had Holley catalogs prior to this one that had the same info. There is a section towards the rear of the catalog that has all the carb list #'s and all the specs for each one.

Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb
 

interesting, thanks.