4BBL for a 307 ????

[gwrba]

Hi

my 307 has a 2BBL holley carb on it.... i've seen a camaro for sale, here, in Argentina, and the owner installed a Rochester Quadrajet 4BBL on it.......

The question i have is ......

Is there any performance difference installing a 4BBL over a 2BBL on a relative very small block as the 307 is ????

is it worh the effort to convert from a 2BBL to a 4BBL on a standard 307...or it will require modifications on the engine itself to take advantage of the new power ??

Seeing the CFM formula, 356 CFM will be enough food to get the engine properly running...... so what is the purpose of installing a 4bbl ???? Does the engine could "EAT" the new amount of fuel mixture, or it will simply eat the needed fuel ( say, 356 CFM as much), and then miss-use all the power of this 4BBL ???

As long as i know, i think the 4BBL is not appropiate for a 307.... are i right ????


I've a Standard 71 Camaro with a 3.08 rear, a 4-speed saginaw and a very standard 307 engine

 

[igotyoubabe325]

I had a 307 with a four barrel manifold and a quadrajet. It ran fine, but I think the carb was properly jetted. Then I found a complete 454 for $700 and bolted it in and the car runs much better now.

 

[stratman315]

If the motor has some modifications such as a hotter cam, headers and better heads, or should I say smaller combustion chamber heads that raise the compression, then a four barrel works well. I had a 307 bored .040 over (313) with an Edelbrock Performer Plus cam and intake, ported 305 HO heads, headers and a Holley 600 cfm 4 barrel and the thing ran great.

Jon

 

[pdq67]

Yes, a Q-Jet or even just a good old Holley 1850, 600cfm four-barrel will run great on a 307, imho..

pdq67

 

[malducci]

If I remember correctly, the 2bbl carbs were rated @ 3.0hg and the 4bbl @ 1.5hg. So the 2bbl 350 cfm carb roughly equal to a 175cfm 4bbl. I think @ 175cfm in 1.5hg, the engine would run out of breath around 3000-3500?

 

[1981coupe400ci]

no mater WHAT size engine a 4bbl is ALWAYS an improvement over a 1 or 2bbl carb..