2V vs 4V, What's your opinion?

I've finally got the Jeep back on the road after rebuilding the trans and installing a new clutch kit. It's time to address my rediculously over cfm'd carb situation. I'm getting 5 mpg or something rediculous like that. I currently have a 600 cfm Holley 4V on it w/ an adapter plate (PO installed). I'm considering the 470 cfm Truck Avenger just because of it's supposed easy tunability and off road performance. Am I wasting my time installing this carb with a 2V manifold? (I am considering putting a 4V manifold from a 360 in it in the future.) Is a 4V system a waste of time on a stock 304? I'm not too concerned about having tons of power. I can get that when I rebuild my axles. What's the best 2V carb to install if I go that route? Thanks and sorry for beating the carb subject to death. I've reviewed alot of the previous posts on the subject but I still can't decide.

 

If you are going to spend money, spend it on a 4 barrell set-up!
Back in the day, everybody was happier with the 4 barrells.

 

Well if you do it smart the primaries are smaller than on a 2bbl you'll get the economy your lookin for and still have power when you need it.

 

I have a 500 cfm edelbrock carb on my 304 mated to a edelbrock torker intake the PO had a 600-650 carter afb on it and it ran way way rich ... runs good now I may put the 450 off road truck carb from edelbrock on her with I get the cash . what gears are you running in the rear? I have 3.73 and i get pretty good gas mileage 15-18 highway

 

I would recerch carbs on hollys and other mfg. web sites because you should be able to go to a 4v carb and have smaller primarys and good size secondarys. witch would give you good gas milage but good power when you put your foot in it.

 

If you're getting 5 mpg in a CJ, especially with a Holley 4bbl, you probably need to look at your power valve. If it's blown, as I suspect, there is a kit (I think cheap) to help keep it from happening again and you can put that in at the same time as you replace the power valve. Good luck.

John

 

I have one of each. Well, had, I went to a 360 under the 4V setup. The jeep with the 2100 on it gets 20mpg on the highway. The jeep with the 304/4V was way over carbed with the little edelbrock carb on it. A spreadbore would work OK on the stock 304, but still probably too much carb for that motor. But to get good torque you want the small primaries that the spreadbore carb offers. Personally I think scoring a 360 4V manifold and tossing a 4V on a stock 304 is a step backwards. A single plane intake like the torquer is great for making horsepower but will actually degrade the low end torque.

 

I have an emissions style 4V intake I would sell you if you want it. It's currently sitting on a 360 that I bought. 100 obo. Plus shipping.

High5

 

Thanks for all the info guys. I'm still not sure what to do.....

High5, what's the difference between a standard and emissions style intake manifold? Here in MI we don't have to worry about emissions.....yet....or again.....

Thanks.

 

Stop carbureting. Crude, fragile, fiddly devices. Use your 2V manifold with GM TBI. JMO.

 

It's got all the fitting to run exhaust back through the intake again. I think you can block them off, not sure though. We don't have to worry about emissions, so I'm not going to run it when it comes time.

High5

 

Yes, it'll have a location for the EGR valve. You can make a plate to cover the EGR valve opening and it will be fine. Probably slightly less efficient than a non-smog manifold, since the design has to accomodate the passages for exhaust gas and the valve, but I'd guess it would not be noticable on a streetable vehicle.

 

I have a 258, .040 over, comp cam, Clifford intake, headers. I tried to get a Holley 390 cfm to work, but the engine did not draw enough vacuum to properly atomize the fuel.
I cleaned and rebuilt an MC2100. Wow. It was a rewarding project, and the Jeep runs MUCH better now.

I realize that my comparison is apples and oranges to your Jeep, but I enjoy tossing in my $0.02...

 

Put a larger 2BBl on instead of the 4BBl. It'll cost less, get better gas mileage and unless you are running a race motor it wont be that much less performance.

My 2 cent Josh

 

The 2V would be just fine..

But the spreadbore 4V would give better milage and be there for some omph. when you need it.

I know a TBI is nice but we have been running carbs for a long time without too much trouble...

a 4v will only draw what the motor wants if set up properly.
I love the sound of a quadrajet opening up when you floor it

So call me old school but my 4.3 will be running a quadrajet and it will be fun..

And no it wont be more money than a TBI.

So my .02 cent 4V spreadbore.