[AC/DC]

I recently came across some Holley carbs. How can I tell what CFM they are? How does one identify carbs if there is no previous knowledge to what it is or trusting what someone tells you its suppose to be? Some of them are in pieces and a couple are complete. Thanks in advance.

[chopperdave70]

you can check the numbers on the choke horn, it will usually have the model number that will let you know what it is

[timemachine]

go to the mortec website, they have a ton of great information.

[suveyman24]

ok guys, the model number will be on the carb. but if it says model 4150, how do i tell if its a 470cfm or a 650cfm?

[2old2fast]

Thier will be 2 numbers on the air horn normally, 1 is a date code the other is a LIST number,date code is useless 'cause it doesn't say which decade, list can be referenced through various sources, post it and I'll bet someone will have an answer for you.



dave

[F-BIRD'88]

You can also measure the pri and sec venturii diameters and throttle bore diameters if the list numbers are gone. 4150's have a front and back metering block 4160's have a metering plate in the back.

[FastOrange]

You can see the numbers stamped on the choke horn in this picture, right down the list number and look it up on the net.