Carburator for AMC 304

My question is very simple (or maybe not?):

What is, in your opinion, the best carburator to mount on an AMC 304?

Thanks.

 

motocraft 2100 think that is what the factory 2V carb is... 20 mpg on the highway... the carter AFBs were also a good choice if your into a 4V carb. The used to be available in a 500 something CFM. I also run a Edelbrock, very similar to the Carter.

 

i ran an edelbrock 650 on my 360 equipped Grand Wagoneer and i absolutely loved it. To this day, that engine/carb combo had the best throttle response than any other vehicle i've ever owned.
dont buy a used carb though... spend the extra bucks and get it new... its pretty much good to go out of the box. You will not be disapointed

 

Quadrajet

 

x4 MC2100

 

Fuel injection.

Then the stock 2100.

 

I've been researching this myself - everyone seems to recommend the Motorcraft 2100. I've found info eluding to the fact that there are many versions of this:

The cfm rating for the M/C 2100 depends on the model that you have. Look for the following numbe sequence in the model number:

1.08 = 200 cfm
1.14 = 200 to 300 cfm
1.21 = 360 cfm

Which is better for the 304? I'm assuming the 360 cfm?

 

Nope, that's right. All the AMC 21XXs were 1.08" venturi AFAIK. The carb on my truck is a 1.08" from a '79 Cherokee 360. Ford used the 1.08s on 302s and maybe 351s (?) and the 1.21 on the 2V apps like the 352 and 360 truck motors. I've only read about 1.14s - picked a few junkyard 2100s but never seen one.

The smaller venturi offers a better vacuum signal at lower volumes of air, so the fuel control is more precise. Mileage and emissions could benefit.

Hey, we have spell check now!

 

Just another vote for the MC2100.

Cheap
Easy to serivce (even in the feild while still on the engine)
Cheap
reliable
Cheap
AMC V8 was designed to be used with an MC2100
Better Torque
Oh, I forgot Cheap... so long as you don't get it from a store. go to the Junkyard. $20-$30. Just make sure the throtle plate shaft moves freely and doesn't have any play in it. I'd stick to a 1.08 or 1.21

 

I also have an Edelbrock Carb. Just had it overhauled and runs solid.

 

I love these questions It's kinda like asking "which tennis shoe is best?".
First, some criteria. Two or four barrel? Stock engine? And the biggie...drum roll please.....What kind of wheeling do you want to do? All of these questions will impact your carburetor choice. Bone stock, I like the 2100. Four barrel, I prefer the Q jet in most instances due to the small primary bores and I generally prefer stepped rod carbs. For Mud bogging and other RPM related activities, I like the AFB over the Holley for the above reasons, though the Holley usually has a slight edge on flat surfaces(but boy I hate that power valve). Unfortunately, in the end, you can line five people up who own five different carb setups, and each will be happiest with the one they are running.

 

Thank you all for all the replies,

So it seems like the motorcraft 2100 is a good choice for a stock 304 engine.

I have struggled for a while with the holley carbs...

jeepdaddy2000 is right, the question is a little generic: right now the engine is 100% stock and 100% tired. It has a remanufactured Holley that worked like crap last time I started the Jeep 2 years ago.

I am looking for a carb that will temporary help me run my jeep and that I could use later after the engine goes thru rebuilt. I expect to have the engine rebored, install better internal components (pistons, cams...), better ignition (don't think I will go as far as fuel injection du to the cost).

As far as the engine work, I will be looking at an improved drivability and performance for steet use as well as good engine reliability. The Jeep will be used daily in town and for week end cruising including fairly mellow trails.

I guess the question falls back to: is the motorcraft 2100 adequate for a modified 304?

 

I am checking into the Edelbrock...

It seems that the Thunder series or performer series, 500-650 cfm would work.

Is it required to buy the Edelbrock intake manifold?

That is quite different from the 200 to 360 cfm of the motorcraft 2100...

Damn, I guess I don't know what I'm talking about:?

 

You can use an AMC 4V manifold. An early 70s 4V manifold from a 360 will work if it's square pattern. Sometime in the mid '70s AMC switched from the square Holley pattern to the Motorcraft spread bore, which is different from all others (not the same as the Rochester Quadrajet spread bore pattern!). You want the early square pattern manifold.

 

It seems like the Edelbrock will run better at higher RPM so I'm now looking more into the motorcraft as I'd rather have some low end torque.

The only thing is I have a hard time to find a motorcraft 2100...is there any place to buy a rebuilt one online or at a part shop? Or the only option is to fish in a junkyard?

I am also wondering if I will need to make any changes to the intake or if the MC2100 will bolt on the AMC 304 intake?

Same question for the airbox, anybody knows if it will fit?

Thanks.

 

I used to have a '77 CJ-5 with a 304 that I ran a 500 cfm Edlebrock on. Basically it is identical to the Carter AFB. The biggest modification I can recomend for this carb is to install the "Off Road"spring loaded needle & seat. Mine ran great after that.

 

I didn't have any trouble finding 2100s in junkyards (pick-your-parts) in CA. What's your location?

There's a fellow that sells 2100s on eBay. He will also build a high-performance 2100 if you tell him your configuration; cam, headers, etc. http://cgi.ebay.com/ebaymotors/Moto...ryZ33550QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

You also should be able to buy a rebuilt 2100 over the counter at most parts stores. Just ask for the carburetor for your Jeep and tell them you have no core.

The 2100 came stock on a 304 Jeep, so yes, of course.

Do you mean the air cleaner? Again, the stock air cleaner will fit because the 2100 came as original equipment with that motor.