Carb CFM's
Thread Starter
Racer
Joined: Sep 2013
Posts: 417
Likes: 11
From: Brigham City Utah
Carb CFM's
So I have this big hole in the front of my 1973 that needs to be filled.
I have a 375 HP 350 waiting to fill the void, Edlebrock Performer manifold and present a new 600 CFM Edlebrock Carb. I was told I might need 650 plus CFM so as not to starve the motor.
I can get an Edlebrock 650 or Holley 670 and send the other back.
What do you think?
Thanks
Karsten
I have a 375 HP 350 waiting to fill the void, Edlebrock Performer manifold and present a new 600 CFM Edlebrock Carb. I was told I might need 650 plus CFM so as not to starve the motor.
I can get an Edlebrock 650 or Holley 670 and send the other back.
What do you think?
Thanks
Karsten
Burning Brakes
Joined: Jan 2007
Posts: 1,057
Likes: 4
From: Concord Calif
So I have this big hole in the front of my 1973 that needs to be filled.
I have a 375 HP 350 waiting to fill the void, Edlebrock Performer manifold and present a new 600 CFM Edlebrock Carb. I was told I might need 650 plus CFM so as not to starve the motor.
I can get an Edlebrock 650 or Holley 670 and send the other back.
What do you think?
Thanks
Karsten
I have a 375 HP 350 waiting to fill the void, Edlebrock Performer manifold and present a new 600 CFM Edlebrock Carb. I was told I might need 650 plus CFM so as not to starve the motor.
I can get an Edlebrock 650 or Holley 670 and send the other back.
What do you think?
Thanks
Karsten
OK here comes the smart a== answer, You were told by some one to change, why the hell you going to ask here when the experts told you what to do!
Now that being said, to little CFM has nothing to do with starving an engine. You can jet any size CFM to run safely on your engine. In general how high do you want to turn this engine? In a smile way to look at it and it is not the best way to do it but works out close air flow wise is that your 600CFM is good to 6000epm, 650CFM good to 6500rpm. I always wonder who is always telling people what to do
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Have this tattooed on your forehead backwards, so you can read it in the mirror:
"Don't over-carburate or over-cam a street engine!"
600 cfm will work just fine on your engine.
Scott
"Don't over-carburate or over-cam a street engine!"
600 cfm will work just fine on your engine.
Scott
Racer
Joined: Feb 2010
Posts: 494
Likes: 0
From: Leominster MA
Its true, its the jets and all the other components setup the correct way that make more of a difference than cfm's will. The engine is going to pull whatever it needs for air no matter what " cfm carb " you stick on it. Its making it all work together that matters.
As a reference the zz383 motor I bought was recommended to use a 750 carb. And that's 425hp. (and that's from the GM instructions).
Just taking a stab at it, the holley street avenger would work well for you 670cfm I think it is. Ive had every carb out there and for a mild street engine, yes don't overdo it. CFM or fancy metered blocks etc. It wont like it or benefit from it.
As a reference the zz383 motor I bought was recommended to use a 750 carb. And that's 425hp. (and that's from the GM instructions).
Just taking a stab at it, the holley street avenger would work well for you 670cfm I think it is. Ive had every carb out there and for a mild street engine, yes don't overdo it. CFM or fancy metered blocks etc. It wont like it or benefit from it.
Le Mans Master
Joined: Oct 2010
Posts: 6,922
Likes: 839
From: melbourne florida
2023 C3 of the Year Finalist - Modified
i agree dont overcarb. however a 600 is a little small for over 350 h.p .
i vote 670 holley street avenger. my 350 is north of 400 h.p and runs a quick fuel hr 750 and loves it. something else may run as good etc, but this one is staying. i would recommend a quick fuel carb any day.
i vote 670 holley street avenger. my 350 is north of 400 h.p and runs a quick fuel hr 750 and loves it. something else may run as good etc, but this one is staying. i would recommend a quick fuel carb any day.
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A basic Holley 750 double pumper runs well on just about anything. The fancier versions allow more tuning, but the Street HP is great out of the box. Since you have a dual plane, a slightly larger carb helps since half the engine can only "see" two barrels at a time.
The Quick Fuel stuff is good too if you find a better deal.
JIM
The Quick Fuel stuff is good too if you find a better deal.
JIM