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Author Topic: Edelbrock Carbs  (Read 1939 times)
BronzeOnSteelies
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« on: August 06, 2007, 08:56:55 PM »



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?   shruggy
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68 MM1 (Turbine Bronze) R/T
Ghoste
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« Reply #1 on: August 07, 2007, 02:40:16 AM »

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.
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aifilaw
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« Reply #2 on: August 07, 2007, 09:25:58 AM »

toss them both and buy a holley or clone DP'er
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'72 B5 Metallic Blue Hardtop
426" Wedge - Hydraulic Roller Stealth heads
68 RT
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« Reply #3 on: August 07, 2007, 01:15:28 PM »

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.
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John_Kunkel
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« Reply #4 on: August 07, 2007, 04:13:21 PM »

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.
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jg68
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« Reply #5 on: August 07, 2007, 06:13:46 PM »

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 Roll Eyes, 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 rotz, 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 2thumbs, even with the stock jets & mixture screws 1.3/4 turns out slap
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aifilaw
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« Reply #6 on: August 07, 2007, 08:19:47 PM »

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 Roll Eyes, 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 rotz, 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 2thumbs, even with the stock jets & mixture screws 1.3/4 turns out slap

I got my old 1411 750 sitting on a bench that probably needs a rebuild... want to buy? Smiley
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'72 B5 Metallic Blue Hardtop
426" Wedge - Hydraulic Roller Stealth heads
jg68
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« Reply #7 on: August 07, 2007, 09:26:25 PM »

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 Roll Eyes, 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 rotz, 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 2thumbs, even with the stock jets & mixture screws 1.3/4 turns out slap

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

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 Cheesy, i'll take it smilielol
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Charger1973
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« Reply #8 on: August 07, 2007, 10:12:32 PM »



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?   shruggy

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...
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aifilaw
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« Reply #9 on: August 08, 2007, 08:32:58 AM »


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

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 Cheesy, i'll take it smilielol

Precisely the original point I was shooting for.
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'72 B5 Metallic Blue Hardtop
426" Wedge - Hydraulic Roller Stealth heads
John_Kunkel
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« Reply #10 on: August 08, 2007, 04:48:28 PM »


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.
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Mick70RR
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1970 Road Runner


« Reply #11 on: August 11, 2007, 02:10:31 PM »

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.
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1970 Road Runner, 505 cid, 4 speed, GV overdrive, 3.91 gears
11.98 @ 117 on street treads
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