I have the stock oem motor craft 2 barrel on my 400m, and i want to just get rid of it since its leaking gas crazy, plus all the hissing sound from all the vacuum leak is annoying
Now, i went into napa and oriley's today, and they both gave me two different types of carburetor choices, the 1405 600cmf edelbrock carb with manual choke, and the other one is the 1406 600cmf edelbrock carb with auto choke.
Do you guys think that a 600cmf size would be good?
If so which carb should i choose?
What kind of gas mileage should i expect?
Oh and my engine is bone stock, open y pipe, and with the exception of all smog emissions deleted except for the pcv system

 

600 CFM will work fine for a 400. I personally prefer an automatic choke, therefore I would go with a 1406. Some prefer a manual choke.

I'm sure this goes without saying that you will need to change out your intake manifold as well.

Whatever you end up doing, don't get performance parts from Napa. I can't imagine how much they mark them up there. Go through Summit.

It's tough to say what your gas mileage will be; it depends on a lot. This shouldn't be on the table if you're working on an old pickup truck.

 

Well, I'm just planning in getting a 4 barrle spacer adapter so I can drop in the new carb without switching the intake

 

And how does an auto choke work? I wouldn't know b/c mine doesn't function properly. :P

 

Personally I think this is a waste of money. Either switch out the intake, or rebuild/replace your 2-barrel.

See this thread: https://www.ford-trucks.com/forums/8...ml#post6939116

 

Well, today i found an edelbrock intake for $75 bucks, why not go check it out?
Its the intake number 2171 Edelbrock.com - Manifolds - Ford - Small-Block - Performer RPM - 351C/351M/400M Which should fit either a 1405, or 1406 carb.
Do you think that that wouldd be a good setup?
And what's the diffrence between the 1405 and 1406 besides one being electric and manual choke?

 

The 1405 is jetted a little richer than the 1406.

I don't know which one would be better for your engine but you could try calling Edelbrock and tell them about your engine and they could make a recommendation for you.

 

THere's no difference between the two. Both calibrated exactly the same. Both 600cfm. Like you said. One is manual choke. One is electric.

 

Incorrect, the only difference is the auto/manual choke as RWENUTS explains. Edelbrock sells a tackle box for changing the jets and metering rods.

 

Actually, it is 2% richer than the 1405, I think that I'm getting the 1405 since my engine does not have and air tubing from the exhaust to go to the back of the carb

 

HUH!!!! THat's new to me!!

 

I stand corrected; I checked Edelbrock's website and the jets and metering rods between the 1405 and 1406 are not the same. However, Edelbrock differentiates them in terms of the sizes of the jets and metering rods. While the 1406 passes more fuel, I'm not sure what math leads to a general statement like "2% richer." Is that supposed to be fuel by volume? What stage of the throttle? Numbers are useless out of context.

The choke on an Edelbrock is electric. It does not use any of the factory choke stove hardware.

 

How does the choke hook up anyways? Through a power source?

 

Yes, an aftermarket all-electric choke such as the one on an Edelbrock takes a hot-in-RUN 12-volt power source. On my '79, I ran it to the connector for the idle stop solenoid. This is ideal because the idle stop solenoid went away when I installed the new carburetor, and it's protected by a fuse.

The electric-assist on the original choke is done differently, and is explained in the thread I linked to earlier.

 

So I shouldn't have a problem getting the 4106 and hooking up the choke right?