Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironangel** · 01-25-2020, 08:12 PM

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,

Warrens69GMC · 01-25-2020, 09:00 PM

How about calling them?

https://www.customcarbs.com/

**Ironangel** · 01-25-2020, 09:54 PM

Quote:

Originally Posted by Warrens69GMC

How about calling them?

https://www.customcarbs.com/

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

**Captainfab** · 01-25-2020, 10:02 PM

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.

**Ironangel** · 01-26-2020, 10:30 AM

Quote:

Originally Posted by Captainfab

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.

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! 👍🇺🇸

**Captainfab** · 01-26-2020, 10:41 PM

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".

**biketopia** · 01-30-2020, 03:26 PM

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

**Captainfab** · 01-30-2020, 10:44 PM

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.

Quote:

Originally Posted by biketopia

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

**biketopia** · 01-31-2020, 07:41 AM

interesting, thanks.

01-25-2020, 08:12 PM	#1
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	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, Attached Images __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" Last edited by Ironangel; 01-25-2020 at 08:18 PM. Reason: adding pics

01-25-2020, 09:00 PM	#2
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,613	Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb How about calling them? https://www.customcarbs.com/

01-25-2020, 10:02 PM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

01-26-2020, 10:41 PM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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". __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

01-30-2020, 03:26 PM	#7
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,008	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 __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350

01-31-2020, 07:41 AM	#9
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,008	Re: Looking to ID a Holley 6R-8026 4bbl "Carb Shop" carb interesting, thanks. __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.