Carburetor choices.

Did some researching of the numbers of my various holley throttle bodies. Seems my 390 is in actuality a List-4548 450cfm. I think this will be an excellent carburetor for our mild 306 build.
I also came up with :
Two 3310-2 750 cfm
One 4118-9 725 cfm
One 1850-2 600 cfm
Going to be fun to try a few different ones.
brad

 

600 sound good for a mild 306

 

I know, a 600 will work well, but this car is going in the hands of a 17 year old. I think the 450 will run well enough for him to get into MORE than enough trouble.
brad

 

In that case, does Holly make a 100 cfm 4 barrel?

 

you may find that the 450 does not feed it enough gas unless you put some BIG jets in it. with the 600 you can always jet it down. i don't know if there is anyone using that small a carb on one. i guess a lot also depends on what your idea of a mild build is.

 

if my memory is still functional, the 4118 was the correct carb for the gt 350s. almost anything in the 600-750 cfm area that is vac secondary will run just fine when properly adjusted.

 

Put the 600vac on and unhook the secondarys. Then when he gets use to it hook them back up.

 

I ran a 450 on a stock 351w without changing jets. Making a littler carb run rich is not the answer. The two barrel is 300cfm, and doesn't need wild jetting either.

Predictably, the 450 on the 351w ran stronger than the 2 barrel did, but not as well as a 600 did.

 

Yes, I don't why all the confusion here about carburetor function. Fuel should be metered in the proper amount to achieve the correct A/F ratio reguardless of the CFM rating of the carburetor. Too rich or too lean is still too rich or too lean whether the carb or engine is big or small. It makes no difference.
Maybe it will make more sense to some of you by looking at this, and yes I know a Maverick is NOT a boat..lol.
http://ebasicpower.com/mm5/merchant.mvc?Screen=PROD&Product_Code=HOL0-80364&Affiliate=fr

Also I once saw a Camaro with a 327 and 500CFM Holley 2V run 13 second ETs. A 450CFM 4V is actually larger than the 500 2V.
Besides, carburetors aren't difficult to change and I have several.
Brad

 

For once...someone who thinks like I do!!

 

Just that facts. Right?
The factory 289 and 302 4v engines came with a 485 cfm autolite carburetor. Surely FoMoCo understands fuel delivery, at least somewhat..lol. I'm not after maximum horsepower here. I'm seeking good off the line accelleration, decent fuel economy and good driveability. Oddly enough I will probably choose an intake that will work into the 6000+ rpm range. That way I won't have to buy another when the time comes for more gear and more power. The Performer RPM and Weiand stealth come to mind or one of their clones.
brad