Suggested carb and intake help

blubuckaroo · Oct 11, 2021

Madgyver said:
I agree with this and the stock for 2 barrel is best for what your driving style is.
I'd say a simple rebuild of your carb.
There was a time when my yellow77 was down for repairs and my stock green77 was my daily. I was impressed with what it could do stock. It went all over the places my yellow77 would go including our secluded fishing spots.

Bucky66 has a C4 and 4.11 gears.
That was my drivetrain and I was pretty much forced to switch to a four barrel and dual exhaust.
What would happened is this...
I'd be driving on a two lane and need to pass another vehicle. When the C4 went into passing gear, the engine would pretty much run out of air at around 3000 RPM, and I'd be left hanging there alongside the other vehicle in the oncoming lane.
The 2 barrel just didn't work well on the highway with lower gears.
The 4 barrel made all the difference.

Rustytruck · Oct 12, 2021

Ask anyone who runs a Quadrajet for more than a year if they would go back to running the stock 2 barrel I doubt you will find any takers. so I will keep my Qjunk and happily motor on. Luckily Jacky doesnt have control over the rest of us as he is so missguided. Maybe the ford 2 barrel is the best carb for a totally stock Bronco rusting away in an old barn. but if you really want to enjoy your Bronco on any other surface then a flat dirt road you just might want to reconsider. best wishes in your choices.

helo-mech · Oct 12, 2021

Madgyver said:
I agree with this and the stock for 2 barrel is best for what your driving style is.
I'd say a simple rebuild of your carb.
There was a time when my yellow77 was down for repairs and my stock green77 was my daily. I was impressed with what it could do stock. It went all over the places my yellow77 would go including our secluded fishing spots.

I'm in agreement with a rebuild of the 2100. I was looking at 'what carb is best' for my 302 10 years ago and finally just went for a good cleaning and rebuild. Been running it since and can keep up with interstate traffic and put it off the beaten path. Haven't even adjusted it in the 10 years.

EDIT.......I missed the below blubuckaroo. Since he has experience with your setup, i would defer to his thoughts on going with the 4 barrel. It just didn't end up making sense in my case.

blubuckaroo said:
Bucky66 has a C4 and 4.11 gears.
That was my drivetrain and I was pretty much forced to switch to a four barrel and dual exhaust.
What would happened is this...
I'd be driving on a two lane and need to pass another vehicle. When the C4 went into passing gear, the engine would pretty much run out of air at around 3000 RPM, and I'd be left hanging there alongside the other vehicle in the oncoming lane.
The 2 barrel just didn't work well on the highway with lower gears.
The 4 barrel made all the difference.

SteveL · Oct 12, 2021

Another vote for a q-jet here except mine sit on offy manifolds so I don't need the adapter.

blubuckaroo · Oct 12, 2021

SteveL said:
Another vote for a q-jet here except mine sit on offy manifolds so I don't need the adapter.

Ok I found it, but for that much I'll be going FI.

https://www.summitracing.com/parts/ofy-5751?rrec=true

68ford · Oct 12, 2021

jckkys said:
Holley is correct. Too many gear heads only consider full throttle high RPM, when real drivers only go full throttle occasionally. Part throttle response is far more important. In 4x4 off road use full throttle is almost never used. The parts that work at full throttle hurt part throttle operation and MPGs. Large carbs and high raise intakes only work efficiently at high RPM. The OE 2 barrel and intake is as effective as any I've seen suggested above. This system is so off road capable, that CJ Jeep owners have even put 2100/2150s on straight 6s. I know of no reason to go to a 4bbl or a Chevy Qjunk. Those that recommend the Qjunk assume there's problems with the OE with no evidence.

Do you ever receive phone calls from people that need help? Asking for a friend

SteveL · Oct 13, 2021

blubuckaroo said:
Ok I found it, but for that much I'll be going FI.
https://www.summitracing.com/parts/ofy-5751?rrec=true

Dang. When I got em a new one was about $250 at summit and the other
Was maybe 100 at the swap meet.

Madgyver · Oct 13, 2021

Green77 is a 302 C4 and stock 3.50 gears. 30x9.50 on stock steel wheels.
Loved it..

DC_Gearhead · Oct 13, 2021

If you are willing to spend some time tuning you can make any holley or Edelbrock work. Sorry I don't know Qjets.

Personally my setup goes against every one advice and runs like a top. 750 double pumper Holley with EB Performer intake, RV cam, and 4.56 gears with 33s.

O2 sensor, vacuum gauge, and some time is what it takes.

Sent from my iPhone using Tapatalk

blubuckaroo · Oct 13, 2021

DC_Gearhead said:
If you are willing to spend some time tuning you can make any holley or Edelbrock work. Sorry I don't know Qjets.

Personally my setup goes against every one advice and runs like a top. 750 double pumper Holley with EB Performer intake, RV cam, and 4.56 gears with 33s.

O2 sensor, vacuum gauge, and some time is what it takes.

Sent from my iPhone using Tapatalk

This sounds like my rolling test lab. I mounted the wideband gauge to a piece of plywood and wired it to a cigar lighter plug so it can be used on all my cars. The hose to the vacuum gauge is about 8 feet long.
This is what it takes to make a carb and distributor run to it's potential. If you're not doing it, you're probably leaving some performance on the table.

DC_Gearhead · Oct 14, 2021

blubuckaroo said:
This sounds like my rolling test lab. I mounted the wideband gauge to a piece of plywood and wired it to a cigar lighter plug so it can be used on all my cars. The hose to the vacuum gauge is about 8 feet long.
This is what it takes to make a carb and distributor run to it's potential. If you're not doing it, you're probably leaving some performance on the table.

Good idea on the cigar lighter!!

Sent from my iPhone using Tapatalk

nvrstuk · Oct 14, 2021

Yup, I've run vacuum hose up throught the hood vents and hang the vac gauge on the cage.

dougsride · Oct 16, 2021

I am currently running a holley street avenger 500 cfm two barrel on my 68 mustang. It hits the spot but the 289 is bone stock. not sure what carb I am going with on my bronco 302 when I get it done but it will be at least a 600 cfm. Watch the guys on engine masters if you can .They did some tests on carb sizes that were pretty surprising. you may be able to see it on you tube or motor trend tv.

seismic · Feb 27, 2024

pcf_mark said:
No comments yet...my guess is that every time someone suggests a carb others flame them.

But I'm not a scared!

Edelbrock Performer (not RPM or AirGap) with a square flange
Holley 600 cfm vacuum secondary carb with Ford kick down linkage and electric choke

It will need some tuning to get it running solid. Before you even install it, take the cintered filter out of the carb inlet, throw it away and use a disposable paper inline filter. Drive it around and see how you like it. It may be jetted too rich from the factory but live with a while then I would reduce the jets from 66-68 stock to 64. That should get you close. Many threads on tuning but this combo will be easy to install, start and drive just fine and you can enjoy it right out of the box.

I think the cheaper Truck Avenger carbs have a bad rep so I have stayed away from them but I have run this combination on 289 in a mustang with C4 and 3.00 gears and on my 289 Bronco, C4, 31" tires with 3.5:1 gears. It just works.

Suggested carb and intake help

blubuckaroo

Grease Monkey

Rustytruck

Bronco Guru

helo-mech

Sr. Member

SteveL

Huge chevy guy

blubuckaroo

Grease Monkey

68ford

Bronco Guru

SteveL

Huge chevy guy

Madgyver

Bronco Madman

DC_Gearhead

Sr. Member

blubuckaroo

Grease Monkey

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DC_Gearhead

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nvrstuk

Just a Bronco driver for over 50 yrs!

dougsride

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seismic

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