billykissell

my 68 cutlass has a STOCK late model(1976) 455 in it. the q-jet has no choke. the hot air is disconnected and parts are missing. i contemplated putting an electric choke conversion. I plan to do some motor work in the next year or so. the more i think about it, i may as well put a new carb on it. do any of you have practical advice regarding the 1405 vs. 1406 edelbrock carbs? all the factory site says is one is set for mileage and the other is set for performance. i assume the richer 1405 would be cooler running. how bad would the mileage difference be? thoughts?

matt69olds

If your looking for suggestions for a carb get a good quality rebuilt Q-jet. I never cared for the Edelbrock carbs. Once you get a good q-jet you'll never consider anything else.

firefrost gold

The edelbrock is a easy carb to work on They have jet and rod kits and springs for set up . I like a manual choke you know when its on and off. JMO

joe_padavano

They are both 600 CFM. The main difference is electric vs. manual choke. The factory jetting is irrelevant unless you are planning to use them on a 350 Chevy. Either one will need to be correctly jetted for your application. Both are too small for a 455. Get a correctly set up Qjet.

caddy

or grab a 1407 (manual) or 1411 (electric), its a 750

ziff396

I had the 1411 electric on my 455, It was okay, but lacked throttle response. Then I tried Holley. Anyways, I now have a custom built (for my application) 800 cfm quadrajet and it's Great! Fast idle, throttle response, and WOT are way better. And just driving around town.

billykissell

Fair enough. Can any of you speak for the choke conversions to electric for a q-jet?

71 Cutlass

Edelbrock tech video says the 600 CFM carbs are fine for motors up to 455. Not sure, never owned a 455. The 1406 (the carb I have, is fantastic), the jetting and interior parts of the 1405 are different than those of the 1406, it's not just a matter of jetting between the 2 carbs. As Joe stated, trial and erorr w/ metering rods, jets, and step up springs applies to every set up, but the 1405 carb is set up for a motor than can handle what it can deliver. Call the tech line at Edelbrock and tell them about your 455 and see which of the two they recommend.

SBORule

I have a 1407 I think it is, manual choke 750 that is in very good shape and I also have the tuning rod and jet kit to go along with it. $200 shipped to your door.

I will take payment via PayPal or check, check must clear before I ship.

PM me if interested. Price is firm.

I ran it on a 350 small block.

Now for the bad news, it will not get near as good gas mileage as a Q-Jet will and Q-Jets are the simplest carb to rebuild. If the choke is missing, no big deal, just make sure you plug that hole on the passengers side with something as it will allow air in through the passage the choke rod was at and it will allow dirt into your engine.

olds 307 and 403

If the hot air coil housings is still there, block the small tube inside and install the electric choke coil. Hook up a key on power wire and you are done.

joe_padavano

It's a 1968. He has the divorced choke.

You may be able to retrofit the later hot air choke housing on your carb body. If so, simply install a Qjet electric choke coil, as used on the 1980s Chevy pickups. Wire it up as shown here:

https://classicoldsmobile.com/forums...ke-wiring.html

billykissell

@-Joe, the car is a 68. the engine is a 455 from 76. the carb id shows its from a chevy. while the rest of the car is original (the 350 is in my garage), the 455 seems to be a frankenstein. it runs great. i may just run a manual choke and not hack the wiring either.

SBORule

Thats what I did, I used a piece of coat hanger and made a bend in it at the end and hooked it up to choke flap and ran the stright length of the coat hanger through the clamp that you are suppose to use to hold the choke cable to the carb and tightened it down on the coat hanger and it was basically a chokeless carb. Just pump the pedal a couple of times and it would start right up, even during the winter but then again, it doesn't snow here.

billykissell

It was 15 degrees Fahrenheit last night.

billykissell

here is the carb. i am frustrated with the "beat it to fit, paint it to match" approach that some half-a$$ed monkey wrenchers have. this is the wrong carb for the engine. the previous owner removed the (divorced) choke thermostat because the intake is for (hot air). it is a manual transmission carb on an automatic transmission vehicle. i'm afraid this q-jet is going to be more trouble than it's worth. am i jumping to conclusions?

SBORule

If your car is running good, don't mess with the carb.

Most of the choke parts are there, atleast you don't have to plug the hole in the side of the carb. I would just buy a rebuild kit for it and a couple can of carb cleaner and rebuild if it isn't running good.

Call around, prices vary.

billykissell

the hot air choke intake is not compatible with the divorced choke carb. enough with scabbed together junk, time for a new carb. is there really a difference between the 1405 and 1406? how drastic? mileage? performance?