Which carb to choose?

[xs29bb1]

I've got a 440  that's 0.30 over w/ a mild cam - the guy who rebuilt it says it's a little over 400 HP to the flywheel and about 520 ft-lb of torque.  I've got the 727 auto trans.

Choosing between Edelbrock 750 cfm Performer or Edelbrock 800 cfm Thunder Series AVS.

Any thoughts on what I should go with, or the +/- of each?  Is 800 cfm too much for what I've got?

thanks

[Scaregrabber]

800 AVS is perfect for your setup. The airdoor is adjustable which controls the secondaries coming in smoothly. 800 is perfect size.

Sheldon

[fy469rtse]

I would go the AVS 800 , very easy to adjust secondary's spring to air door, unless your experienced with carburettors the holly is a bit more complicated to tune,
The edelbrock is a direct copy almost of the original carters that came out on these cars, so if you want it to look correct also I would go with the 800

[1974dodgecharger]

I would go the AVS 800 , very easy to adjust secondary's spring to air door, unless your experienced with carburettors the holly is a bit more complicated to tune,
The edelbrock is a direct copy almost of the original carters that came out on these cars, so if you want it to look correct also I would go with the 800

not really...the HOlley has more settings to adjust, but overall its a lot easier once you go step by step and then you realize with all the adjustments one can alot more choices to pick to fine tune it for more power.  There was a sticky on the holley tunning somewhere..great thread and very easy to use.

[kokxville]

I would go the AVS 800 , very easy to adjust secondary's spring to air door, unless your experienced with carburettors the holly is a bit more complicated to tune,
The edelbrock is a direct copy almost of the original carters that came out on these cars, so if you want it to look correct also I would go with the 800

not really...the HOlley has more settings to adjust, but overall its a lot easier once you go step by step and then you realize with all the adjustments one can alot more choices to pick to fine tune it for more power.  There was a sticky on the holley tunning somewhere..great thread and very easy to use.

whre can i find this sticky on the holley tuning? 

[xs29bb1]

Thanks a lot guys.   

I guess the big question for me is whether 800 cfm is too much.  Does anyone think I'll lose too much throttle response going higher than 750 cfm?

[cudaken]

My self, Holley 750.

Far as tuning a 750 Holley, here are a few U Tube links.

https://www.youtube.com/results?search_query=How+to+cahng+jets+in+a+750
https://www.youtube.com/watch?v=5_lgTTkXJDM

Cuda Ken

[BSB67]

Thanks a lot guys.   

I guess the big question for me is whether 800 cfm is too much.  Does anyone think I'll lose too much throttle response going higher than 750 cfm?

No, and no.

You did not say what you have or are planning, but I would recommend a dual plane intake manifold as well.

[Paul G]

If you want to learn how a carburetor works, get the Holley. If you want to set the idle and drive, get the Edelbrock.

[xs29bb1]

Yeah, I'm going Edelbrock either way.  It's either the Performer 750 or the Thunder Series 800 AVS.

As long as the 800 isn't too much, I plan to go with that.

[fy469rtse]

If the 440's healthy , 800 not too much, easy changes to jets and step rods, had 800 on a warm 383 , engine loved it

[myk]

100% NO on the Edelbrock.  If I didn't need a 'carb to run the Charger I'd send my 750 to you for free as I hate it that much.  If you bother to become acquainted with your car, test, tune and tinker with it you'll realize just how limited the 'Eddy 'carbs are...

[1974dodgecharger]

If you want to learn how a carburetor works, get the Holley. If you want to set the idle and drive, get the Edelbrock.

Paul is right there between the two.

I personally like the Holleys because I can adjust the nozzles, pump cams, etc....and tweak it to what I think its good or bad thats just me though.  If someone goes back on the edelbrock and its non adjustable then you will need to get it rebuilt.  Just my lonely mans opinion.......

[xs29bb1]

Wow, lots of different opinions - thanks to all who took the time to respond!

myk - so the Thunder Series AVS isn't tunable enough in your opinion?

[hemihead]

 IMO I wouldn't put a Holley on my Mopar if I was paid to . There is a reason Mopar used Carters ( with a few exceptions ) . But do as you see fit .

[Budnicks]

100% NO on the Edelbrock.  If I didn't need a 'carb to run the Charger I'd send my 750 to you for free as I hate it that much.  If you bother to become acquainted with your car, test, tune and tinker with it you'll realize just how limited the 'Eddy 'carbs are...

[Budnicks]

IMO I wouldn't put a Holley on my Mopar if I was paid to . There is a reason Mopar used Carters ( with a few exceptions ) . But do as you see fit .

yeah the reason is the bean counters in management, they were the cheapest bid from Carter & Holley's were originally used on many Mopars out of the factory too, by the way...

[Budnicks]

IMHFO, it's just that from someone who has run all three types of 4-bbl's on many different combos, if your dead set on using a Carter style carburetor get a original AVS of AFB or even a Thermoquad, not a Edelbrock Carter/Weber copy, Edelbrock makes some great parts but carbs aren't one of them...   personally I'd buy a Quickfuel SL or QFT 800 Vacuum Secondary with electric choke & never look back, way better carbs hands down... but it's your car, do what you think is right...

[fy469rtse]

I'm running the AVS for street and economy, tuning it very easy carb but it has its limitations for me, for serious street and track use have one of the proform range , there's company's out there that take what holly made and improve it,
Have a look at there street vacuum secondary range and go from there, you can't go wrong 750 should do it for a mild to stock 440 , Ron on here put me on to these and there the better version of a holly,

[BSB67]

It is pretty well known and documented that the Edelbrock 1407 is a turd, and tuning it is both too much effort and beyond the skills of most hobbyists. Find an original carter AFB or AVS with 1 11/16 throttle bores and it will outperform the 1407 in every measure.

However, that is not the case with all Edelbrock carbs, and most notably the 800 cfm Thunder.  There are engine builders/dyno operators that have concluded that the 1407 is junk, but will highly recommend the 1812 for some applications based on their findings on the dyno.  FWIW

[1974dodgecharger]

IMHFO, it's just that from someone who has run all three types of 4-bbl's on many different combos, if your dead set on using a Carter style carburetor get a original AVS of AFB or even a Thermoquad, not a Edelbrock Carter/Weber copy, Edelbrock makes some great parts but carbs aren't one of them...   personally I'd buy a Quickfuel SL or QFT 800 Vacuum Secondary with electric choke & never look back, way better carbs hands down... but it's your car, do what you think is right...

what if he wants a 1000 series plus dominator on his stock 318 shouldnt we steer him away from that 

[myk]

Wow, lots of different opinions - thanks to all who took the time to respond!

myk - so the Thunder Series AVS isn't tunable enough in your opinion?

Honestly I'm speaking in regards to the original Performer line; I have the 1411/750 cfm on my Charger.  Even though I don't run the Thunder I can't imagine they're more different than the Performer 'carbs.  Holley 'carbs have so many variables to tune that it seems like a nightmare at first, but then you realize that the wide range of tunability is there for a reason.  Clearly, I'm not the only one that feels this way about these 'carbs, so keep asking questions and talking and then make your choice...

[Charger-Bodie]

Wow, lots of different opinions - thanks to all who took the time to respond!

myk - so the Thunder Series AVS isn't tunable enough in your opinion?

Honestly I'm speaking in regards to the original Performer line; I have the 1411/750 cfm on my Charger.  Even though I don't run the Thunder I can't imagine they're more different than the Performer 'carbs.  Holley 'carbs have so many variables to tune that it seems like a nightmare at first, but then you realize that the wide range of tunability is there for a reason.  Clearly, I'm not the only one that feels this way about these 'carbs, so keep asking questions and talking and then make your choice...

I agree with you about the(non)performer carbs,but the Avs Thunder series is an awsome carb for a mild build. I love Holleys when you start getting wild and bigger stroke etc.

[myk]

Wow, lots of different opinions - thanks to all who took the time to respond!

myk - so the Thunder Series AVS isn't tunable enough in your opinion?

Honestly I'm speaking in regards to the original Performer line; I have the 1411/750 cfm on my Charger.  Even though I don't run the Thunder I can't imagine they're more different than the Performer 'carbs.  Holley 'carbs have so many variables to tune that it seems like a nightmare at first, but then you realize that the wide range of tunability is there for a reason.  Clearly, I'm not the only one that feels this way about these 'carbs, so keep asking questions and talking and then make your choice...

I agree with you about the(non)performer carbs,but the Avs Thunder series is an awsome carb for a mild build. I love Holleys when you start getting wild and bigger stroke etc.

What is the difference between the Performer and the Thunder?

[Paul G]

I picked up a used Holley 670 a while back. Put a kit in it, put it on the 360 and it was running extremely lean. Had to up the jetting 4 sizes front and back to get it to run right. Larger squirter and play with the pump cams to eliminate an off idle bog. It runs like a scalded dog now.

That is what you do with a Holley. They are great carbs to get the max power out of your set up. But you need to tune them for your engine. They wont run well right out of the box, in a lot of cases. Where as an Eddy will run well most times, just harder for simple guy like me to tune an Eddy for max performance.