Edelbrock Carbs

[BronzeOnSteelies]

My 68 has a stock 440 as far as I know. It came with an Edelbrock Performer Carb #1407 (750cfm) with an electric choke kit. I have a 727 trans with 3:23 gears and street intentions only.
I have read through a lot of carb and throttle linkage threads on this site and have what I guess is a basic question.

About three of my buds have advised me that the carb I have is for a Chevy, that the 440's need to run on a Carter AVS or the new version by Edelbrock (Thunder Series AVS carbs i.e. 1806).

I saw a thread on the site where a lot of guys used the Performer carbs for 383's.

I ask also because I have a hesitation unless I tromp on it and the acceleration of the car is a little less than I anticipated.

Without going thru all the things I have done to alleviate the hesitation I am interested in the question does it have to be an AVS?   

[Ghoste]

The carb you have is a knockoff of the old Carter AFB.  Your friends are right that your car came stock with an AVS but the AFB was used on a lot of Chrylser products as well (the 426 Street Hemi for example).  I would try to tune the AFB first before running out and buying the Eddy AVS.

[aifilaw]

toss them both and buy a holley or clone DP'er

[68 RT]

On my car I had the same problem you have. Changed the step up springs and rods. And also the primary jets. But the tuning kit for the 1407/1410. Check summit racing or local speed shop. Also auto zone pep boys etc should be able to get them to.

[John_Kunkel]

From my personal experience the off-idle stumble is common with the Carter/Edelbrock carbs, I believe it's because of the lazy accelerator pump design.

The stumble is the result of a temporary lean condition that occurs when the fuel delivery changes from the idle circuit to the transitition slot as the butterflies open and introduce more air; without a good pump shot to enrich the mixture the engine stumbles. Running the idle mixture slightly overrich will often cure the stumble.

[jg68]

From my personal experience the off-idle stumble is common with the Carter/Edelbrock carbs, I believe it's because of the lazy accelerator pump design.

The stumble is the result of a temporary lean condition that occurs when the fuel delivery changes from the idle circuit to the transitition slot as the butterflies open and introduce more air; without a good pump shot to enrich the mixture the engine stumbles. Running the idle mixture slightly overrich will often cure the stumble.

Yep, i had the same problem with my 1411 750, i paid 55.00 for the tune-kit, that was a total waiste of money, so i returned it, all the springs did was either delay the stumble or speed it up , never cured it, so i got smart & opened up the IFRs in the primary boosters, this help the stumble some, then i drilled out the squirter to a .041 from the .035, this made a world of difference, so iopened it up alittle more to a .045 & it was even better, then i put the pump arm in the middle hole for kicks, it stumbled bad again , so then i realized it was all in the pump shot on these carbs, so i put it back in the top hole & bent it a hair more for an even longer shot, it was dead on, throttle responce up the ying-yang , even with the stock jets & mixture screws 1.3/4 turns out

[aifilaw]

From my personal experience the off-idle stumble is common with the Carter/Edelbrock carbs, I believe it's because of the lazy accelerator pump design.

The stumble is the result of a temporary lean condition that occurs when the fuel delivery changes from the idle circuit to the transitition slot as the butterflies open and introduce more air; without a good pump shot to enrich the mixture the engine stumbles. Running the idle mixture slightly overrich will often cure the stumble.

Yep, i had the same problem with my 1411 750, i paid 55.00 for the tune-kit, that was a total waiste of money, so i returned it, all the springs did was either delay the stumble or speed it up , never cured it, so i got smart & opened up the IFRs in the primary boosters, this help the stumble some, then i drilled out the squirter to a .041 from the .035, this made a world of difference, so iopened it up alittle more to a .045 & it was even better, then i put the pump arm in the middle hole for kicks, it stumbled bad again , so then i realized it was all in the pump shot on these carbs, so i put it back in the top hole & bent it a hair more for an even longer shot, it was dead on, throttle responce up the ying-yang , even with the stock jets & mixture screws 1.3/4 turns out

I got my old 1411 750 sitting on a bench that probably needs a rebuild... want to buy?

[jg68]

From my personal experience the off-idle stumble is common with the Carter/Edelbrock carbs, I believe it's because of the lazy accelerator pump design.

The stumble is the result of a temporary lean condition that occurs when the fuel delivery changes from the idle circuit to the transitition slot as the butterflies open and introduce more air; without a good pump shot to enrich the mixture the engine stumbles. Running the idle mixture slightly overrich will often cure the stumble.

Yep, i had the same problem with my 1411 750, i paid 55.00 for the tune-kit, that was a total waiste of money, so i returned it, all the springs did was either delay the stumble or speed it up , never cured it, so i got smart & opened up the IFRs in the primary boosters, this help the stumble some, then i drilled out the squirter to a .041 from the .035, this made a world of difference, so iopened it up alittle more to a .045 & it was even better, then i put the pump arm in the middle hole for kicks, it stumbled bad again , so then i realized it was all in the pump shot on these carbs, so i put it back in the top hole & bent it a hair more for an even longer shot, it was dead on, throttle responce up the ying-yang , even with the stock jets & mixture screws 1.3/4 turns out

I got my old 1411 750 sitting on a bench that probably needs a rebuild... want to buy?

I really don't want to mess with them anymore, they just don't compare to a holley, too me, even at a cheap price, there just not worth it, now if your giving it away , i'll take it

[Charger1973]

My 68 has a stock 440 as far as I know. It came with an Edelbrock Performer Carb #1407 (750cfm) with an electric choke kit. I have a 727 trans with 3:23 gears and street intentions only.
I have read through a lot of carb and throttle linkage threads on this site and have what I guess is a basic question.

About three of my buds have advised me that the carb I have is for a Chevy, that the 440's need to run on a Carter AVS or the new version by Edelbrock (Thunder Series AVS carbs i.e. 1806).

I saw a thread on the site where a lot of guys used the Performer carbs for 383's.

I ask also because I have a hesitation unless I tromp on it and the acceleration of the car is a little less than I anticipated.

Without going thru all the things I have done to alleviate the hesitation I am interested in the question does it have to be an AVS?   

I just bought one of the Thunder Series AVS carbs for my 73 400.  I never heard there was only one certain model you could use, its just the one I wanted.  The AVS just means it has easily adjustable secondaries.  Im not an expert but really I think you should be fine with the carb you have.  They all basically do the same job...

[aifilaw]

I got my old 1411 750 sitting on a bench that probably needs a rebuild... want to buy?

I really don't want to mess with them anymore, they just don't compare to a holley, too me, even at a cheap price, there just not worth it, now if your giving it away , i'll take it

Precisely the original point I was shooting for.

[John_Kunkel]

That is why I don't run the Carter type either, no matter how much you tweak the pump it will never be as positive as the Holley design.

[Mick70RR]

My 440 Road Runner had a new eddy #1407 carb fitted when I got it and it had never been tuned. Car didn't run too well and I spent a long time getting it right. I found the stock jetting way too rich and ended up with 107 primaries with 7337 rods and 104 secondaries. A few other mods were made and now the car runs fine. It's a simple carb and easy to work on, rods can be changed in about 30 seconds and you don't spill fuel over the hot engine when you are changing jets.