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Old 07-10-2012, 08:11 AM   #1 (permalink)
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Default Edelbrock 1405 too much carb for a mostly stock 289?

Just the question, as I'm looking into other problems with the 'stang, I got to thinking about the carb in general. I mean, the motor is a 289 with a mild cam in it. Is a 1405 manual choke too much carb for this motor?
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Old 07-10-2012, 09:37 AM   #2 (permalink)
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Is that a 600CFM carb? Probably marginal. I remember back in the day I pulled off my 4100 and installed a 600CFM Holly and it ran like a dog. Put the Autolite back on and got my performance back. After spending many hours trying to make the Holly work.
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Old 07-10-2012, 09:50 AM   #3 (permalink)
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Yes. John--Las Vegas
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Old 07-10-2012, 10:14 AM   #4 (permalink)
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Is that a 600CFM carb? Probably marginal. I remember back in the day I pulled off my 4100 and installed a 600CFM Holly and it ran like a dog. Put the Autolite back on and got my performance back. After spending many hours trying to make the Holly work.
Yes it is. I was afraid someone would say this

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Yes. John--Las Vegas
Another vote towards "yes" and cementing my fear.

What 4 barrel carb and intake should I put on this car would you guys suggest? Autolite 4100 with performer intake?
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Old 07-10-2012, 10:16 AM   #5 (permalink)
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An old Autolite 480 cfm carb is widely considered about a perfect match for a 302. An Edelbrock 500 cfm is pretty close to that. That said, any number of folks are happily driving with 600 cfm carbs. Being just that much bigger means you might be missing out on a little snappier throttle response and a smidge of mileage. Very small differences that you can't really tell unless you are really tuned into what your car does. And to tell it you'd have to swap a perectly tuned carb for another perfectly tuned carb.
When people are looking for a new carb, I recommend a 500. But since you already have a 600, I'd run with it unless it's giving you problems you just can't fix. The 100 cfm difference isn't THAT big a deal and you should be able to tune that carb to run just fine for you.
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Old 07-10-2012, 10:31 AM   #6 (permalink)
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Holley makes a 450 Vac sec with the ford linkage and elect choke.

I dont know why a 600 is such a mainstream number. imo its too big for most situations with folks who are running mostley stock parts.

MFGs should make more 450 and 500's

Back in the early 90's I had a Holley 600 Vac sec (#80457) on mine and it ran like a bat out of hell but......
I was fouling plugs like crazy.

in the late 90's I went back to my old faithful 2100 which I had Pony rebuilt for me and although she dont run like a bat out of hell anymore the maitenence is a lot less and she fires up every time. lol
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Old 07-10-2012, 10:32 AM   #7 (permalink)
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An old Autolite 480 cfm carb is widely considered about a perfect match for a 302. An Edelbrock 500 cfm is pretty close to that. That said, any number of folks are happily driving with 600 cfm carbs. Being just that much bigger means you might be missing out on a little snappier throttle response and a smidge of mileage. Very small differences that you can't really tell unless you are really tuned into what your car does. And to tell it you'd have to swap a perectly tuned carb for another perfectly tuned carb.
When people are looking for a new carb, I recommend a 500. But since you already have a 600, I'd run with it unless it's giving you problems you just can't fix. The 100 cfm difference isn't THAT big a deal and you should be able to tune that carb to run just fine for you.
Hmm, yes I see your point. I am suspect of the carb causing my poor running issues. Just wondering if it's worth fixing or stepping down to something a little smaller. Thanks for the counterpoint!
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Old 07-10-2012, 11:09 AM   #8 (permalink)
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Well here's my .02.

I have the 1406, which is the electronic choke ( manual is better in my opinion )

I dont have any issues on my stock 289. no lack of performance or anything. once its warmed up. hit the gas and it pulls instantly. The only issue im having with mine is that in the morning, I cant get the choke to go through, so it takes about 15-20 minutes to warm up that way it wont stall when I hit the gas lol
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Old 07-10-2012, 11:58 AM   #9 (permalink)
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My plugs were pretty fouled, too much gas for sure. That may be a carb tuning issue however
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Old 07-10-2012, 12:07 PM   #10 (permalink)
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If you've already got the carb, I would recommend keeping it. Fouling plugs has absolutely nothing to do with having a too big a carb. It has everything to do with running the air/fuel mixture much too rich.

Pick up an Edelbrock tuning kit for your carb. It's just a bunch of jets and metering rods. It's not very expensive. Follow the instructions in the user manual for your carb to calibrate it. Basically, you keep leaning it out until it starts "surging". Then you go back one or two steps.

You can also buy an electric choke kit for your carb which easily installs. If you correctly connect and adjust electric chokes, they work amazingly well.

Thousands upon thousands of people have successfully run a 600 CFM carb on a 289. Sure, you can argue that it's too much carb. But if it works, it works. And I definitely think you can get it to work.

Last edited by Klutch; 07-10-2012 at 12:09 PM.
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Old 07-10-2012, 12:25 PM   #11 (permalink)
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Quote:
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If you've already got the carb, I would recommend keeping it. Fouling plugs has absolutely nothing to do with having a too big a carb. It has everything to do with running the air/fuel mixture much too rich.

Pick up an Edelbrock tuning kit for your carb. It's just a bunch of jets and metering rods. It's not very expensive. Follow the instructions in the user manual for your carb to calibrate it. Basically, you keep leaning it out until it starts "surging". Then you go back one or two steps.

You can also buy an electric choke kit for your carb which easily installs. If you correctly connect and adjust electric chokes, they work amazingly well.

Thousands upon thousands of people have successfully run a 600 CFM carb on a 289. Sure, you can argue that it's too much carb. But if it works, it works. And I definitely think you can get it to work.
Mine works and i have a 289... 600 will be good if you plan to go with heads, and a cam someday too... its a good foundation for later advancement
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Hooker Headers, 2.5" Magnaflow X pipe, Spintech 6000 Pro streets 2.5" Exhaust, Monte Carlo Bar, 600 CFM edelbrock Carb w/ Electronic Choke, Edelbrock RPM Air-gap Intake, early model 302 heads, MSD Super Conductor Custom Wires, MSD Pro-Billet Ready to Run Distributor.
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Old 07-10-2012, 12:29 PM   #12 (permalink)
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I ran a 1406 on my 289 for 20 years with no problems. It had a Holley 600 for less than a year I couldnt get tuned right.
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Old 07-10-2012, 12:34 PM   #13 (permalink)
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I will do headers at some point, it does already have a "Lenny" cam in it. I would prefer to NOT mess with a new carb if at all possible. So I will take this all in and make a decision. Thanks for your help and opinions everyone!
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Old 07-10-2012, 12:42 PM   #14 (permalink)
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I will do headers at some point, it does already have a "Lenny" cam in it. I would prefer to NOT mess with a new carb if at all possible. So I will take this all in and make a decision. Thanks for your help and opinions everyone!
It's pretty much a given that you WILL have to mess with a new carb. There are too many variables for the factory settings to be dead-on right out of the box. One of the nicest things about an Edelbrock carb is it's extremely easy to calibrate. You don't even have to remove the carb. You can easily replace the jets and metering rods with the carb bolted to the engine.

Just because you bolt on a new carb and the engine runs OK doesn't mean it's correctly calibrated. If it's too lean, it won't run correctly and could cause the combustion chambers to run too hot. If it's too rich, you're just wasting gasoline by spewing unburned fuel out the exhaust.
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Old 07-10-2012, 12:46 PM   #15 (permalink)
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theres no reason to be afraid of a carb. they're easy as hell to tune if its an edelbrock.
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Hooker Headers, 2.5" Magnaflow X pipe, Spintech 6000 Pro streets 2.5" Exhaust, Monte Carlo Bar, 600 CFM edelbrock Carb w/ Electronic Choke, Edelbrock RPM Air-gap Intake, early model 302 heads, MSD Super Conductor Custom Wires, MSD Pro-Billet Ready to Run Distributor.
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