unknown cfms on holley carbs

[silverscottsk10]

I just received two Holley carbs and im a bit lost on the cm they are
the first is a model 2870 with manual choke
the second is a model 2606 with electric choke
they are both in good condition and the one with the higher cfm will be going on my k10
any answers or links would be appreciated
thank you in advance

 

[silverscottsk10]

@HotRodPC you know anything on how to tell?

 

[Boone83K10]

give us the numerical listing off the air horn, that will go a long way in your search of information.

 

[HotRodPC]

Yep, aka the List #. Like an older one that I recall, List 1850-X, usually X either being 1, 2, 3 and maybe even a 4. The X would be considered like a Revision #, but the 1850 is a 600cfm Vacuum Secondary. You'll have to know that #.

 

[chengny]

#1 on the Holley FAQ list:

How do I find the "list" number on my carburetor?

"The list number for most performance and factory 2 and 4 barrel carburetors will be found stamped into the upper right hand corner of the airhorn or sometimes called the choke tower. On the 4150 HP models that do not have a choke tower the list number will be stamped into the mainbody behind the throttle linkage. This number is used to identify the carburetor and also used when needing service parts or renew kits."