carb. CFM. ?

[Highbanked Hauler]

How can you tell what CFM a carburetor is? 

[Brightyellow69rtse]

 you run the numbers stamped on it it will identify it. You can just google them and the info should pop u.

[John_Kunkel]

Most OEM carbs never got an advertised CFM rating.

[Highbanked Hauler]

 I had "heard" that a 4617 carter was about 670 cfm  but aftermarket carbs do have  ## on them ??

[John_Kunkel]

That's probably a closer guess than most who would claim a 440 carb is 750 cfm.

[440]

Most OEM carbs were around 600-650 cfm as far as I knew.

Always sorta boggled my mind how a 6 pack car could ingest 1200cfm of air for a fairly mild oem engine.

[71bee]

I know that Carter's AFB models were sporatic on CFM ratings in the early years. the AVS models came in 625 CFM (340-383) & 750 CFM (440). Thermo-quads are either 800 CFM (318-360) or 850 CFM (360 HP-440)

[BSB67]

Most OEM carbs were around 600-650 cfm as far as I knew.

Always sorta boggled my mind how a 6 pack car could ingest 1200cfm of air for a fairly mild oem engine.

It doesnt

[440]

Well, no it wouldn't. But in saying that 1200cfm seems like a bit much, I know you drive mainly off the center carb which is good for fuel economy and air speed. Open the outboards and what benefit do you get from them on a fairly mild engine that you couldn't get with a good 4 barrel (economy aside)

[BSB67]

Well, no it wouldn't. But in saying that 1200cfm seems like a bit much, I know you drive mainly off the center carb which is good for fuel economy and air speed. Open the outboards and what benefit do you get from them on a fairly mild engine that you couldn't get with a good 4 barrel (economy aside)

Rated as a 2bbls, they are 1350 cfm, as a 4 bbl they are 955 cfm.  Generally, the larger cfm will make more power, but only to a point as you imply. With everything being equal, will 955 cfm make more power than an 800 cfm on a stock 440? Maybe, maybe not.  However, with that said, everything is not equal.  Much of the advantage (and it is not small) of the 6 Pack is in the intake manifold.

[crankypat]

  wondering what does it mean  a divorced  choke. trying to get a hot air set up from rock auto and they only have divorced ones.?

[crankypat]

     

[71bee]

 wondering what does it mean  a divorced  choke. trying to get a hot air set up from rock auto and they only have divorced ones.?

Chrysler always used a divorced choke. all that means is that the choke thermostat is mounted to the intake, not on the carb like most GM & Ford carburetors, "Divorced" from the carb body. a linkage from the thermostat to the choke opens the choke valve.  

[crankypat]

  thanks. rock auto didnt know.. thanks again. time to order it.  i want to cruise soon?

[440]

Sometimes I wonder the intelligence of the people behind the parts counter. You ask for something simple and they still cant figure it out. It's like you ask for a coke and they hand you a root beer.

[71bee]

Sometimes I wonder the intelligence of the people behind the parts counter. You ask for something simple and they still cant figure it out. It's like you ask for a coke and they hand you a root beer.

I agree 100%! it's like I always tell my friends, "if you know nothing about cars, go apply at Auto Zone. their sure to hire you!"