Old/Period Holley carb on my '76 - keep or get Autolite?

[tirewater]

My CA emissions/smog 1976 bronco has an old Holley carburetor on it. I recently purchased the truck, so I don't know the history of the engine.

The carburetor needs a rebuild.

Should I source a reman/used Autolite 2100 carburetor or just rebuild what I have?

The biggest benefit of the Holley is that I'll know how to re-install, by attaching the hoses the way they came off.

The truck currently 'runs' a bit roughly, but quite a bit of fuel ends up in the air filter housing. It's not what I consider safe to run.

Is there any chance that this is the original carburetor? I don't know if the CA emissions trucks would have a different fuel system than non CA ones.

I don't know the model of the existing carb, but it's virtually the same as this one cleaned up here:
http://blog.hemmings.com/index.php/2009/10/02/the-holley-is-reborn

I suppose ultimately it doesn't matter, any appropriate carb should "run" correctly once tuned. I do like the idea of having a stock carburetor, if anything to ensure that my smog equipment is similar to other trucks.

Thanks for any info!

 

[jckkys]

You have a Holley 2300 that was designed as a replacement for early '70s Ford 2100 carburetors. It was modified from the typical 2300 configuration to easily swap into the place of 2100s with a float bowl that has the fuel inlet in the same location and the hot air inlet on the choke housing matches the 2100 choke housing. The throttle arm also matches Ford 2100 truck throttle arms. To install an OE 2100 in place of the Holley couldn't be easier. The Holley is also a fuel economy and emissions design. The booster venturis look like a wagon wheel to provide a stronger booster signal and better atomization of fuel droplets. The air flow is reduced some. So 350cfm becomes 320cfm. The idle and part throttle mixture are adjustable with the reverse direction idle adjustment screws. It also has a 2 stage power valve. The Holley will give a little better fuel economy and help you pass emission inspection. On the other hand, the Ford 2300 is a better carburetor off road, is less prone to leak, and is a better design. Since swapping the Holley and Ford is simple by design, I would get an OE 2100 Ford and use what works best in the current situation.

 

[tirewater]

Thanks a lot! Way more information than I expected.

Now the search for a 2150 with smog begins.

 

[jckkys]

For a '76 you''ll want a 2150. They're nearly identical to 2100s. The difference is choke pull off diaphragm screwed to the rear of the carb. The '76 carb has no PCV nipple like earlier 2100s. The PVC nipple is on the front of the EGR spacer. It should look like this one on ebey;
http://www.ebay.com/itm/NOS-Ford-Ca...51W-Mustang-Bronco-302-/262162128552?hash=ite
Here's a good example of the 2150 that was OE in '76 Broncos;
http://www.ebay.com/itm/Rebuilt-Mot...or-/331360023559?hash=item4d2698b407:g:Ay8AAO

 

[Justafordguy]

My 77 had the same 2300 on it when I got it. I rebuilt it but could never get it to work well Offroad. I replaced it with a 2150 and it works awesome now. The 2100/2150 is a much better carb for a Bronco.

 

[johnbeck]

While your on the subject of carbs., I just got running a 73 Bronco-has an edelbrock manifold and a edelbrock 600 carb(1406), auto trans, stock wheels. I don't tow, don't go off road much. I greatly would appreciate your recommendation for carburation(Even if you suggested a two barrel). New Bronco owner(4 months), John Beck

 

[Broncobowsher]

While your on the subject of carbs., I just got running a 73 Bronco-has an edelbrock manifold and a edelbrock 600 carb(1406), auto trans, stock wheels. I don't tow, don't go off road much. I greatly would appreciate your recommendation for carburation(Even if you suggested a two barrel). New Bronco owner(4 months), John Beck

This is what is considered a thread hijack. Come into a thread with something that is only 10% relevant to the original conversation and sideline the conversation to something very different.

You will get much better results if you start a new thread that isn't confused with the original and very different conversation.

 

[johnbeck]

Sorry about the high-jack- I got too excited finding individuals with such detailed knowledge of 40+yr old carburetors!