Decided that i am going to get a new carburetor, don't know when exactly, but soon, within the next 3 to 6 months. I want a carburetor with a 4 corner idle circuit. I have come to realize that the edelbrock 600cfm performer i have now doesnt have many tuneable fetures regarding the idle circuit.
I have narrowed bit down to 2 choices, the carburetor i wanna upgrade too. And i am looking at a Demon a speed demon 650cfm vaccum secondary with electric choke and 4 corner idle and demon's eze idle feture, it is 456.00 bucks, the other carburetor i have been looking at is a Quickfuel Hr series 680cfm vaccum secondary electric choke carburetor it has a 4 corner idle circuit and changeable idle air bleeds, it is 399.00. Now i am leaning a little more towords the Demon carburetor because i can purchase a book called how to tune and win with demon carburetors, wich would help me learn how they work and how to work on them, even tho it is a little more money vs the quickfuel hr series, but i couldnt find any books on the quickfuel carbs.
But on the other hand i could order a quickfuel carb from don at fbo systems and he would re-jet it so it would be close for my application when i got it. Since i am 4000 feet above sea level, But i also have don's tuning to win book, wich has alot of information on how to tune the 4 corner idle circuit on the demon carburetors and a few other things on the demon carburetor.
So i feel i have more information available to me on the demon carburetor, altho the quickfuel is cheaper and i have heard great things about them, not having any books on there carbs makes it kind of scary to buy one, because i could purchase the how to tune and win with demon carbs and i would have a descent understanding of how they work and how to tune them. So anyways wich one of these carbs would you guys reccomend?
The engine the carburetor will be going on is a 300hp crate 360 magnum with a dual plane edelbrock rpm air-gap intake manifold, 1 5/8 hedman hedders and a mopar performance distributer that i purchased from don at fbo systems he curved and phased it, i'm running 14 degrees of initial timing 32 degrees total timing with another 10 degrees of timing from my vaccum advance at idle so i'm accually sitting at 24 degrees at idle with vaccum advance on manifold vacccum.
The edelbrock is doing ok... But i feel i could get a way better idle and better performance with a different carburetor. Oh and this engine the carb will be going on is a 1991 dodge ram half ton short bed truck with a 4 inch lift and 33 inch tires with an A-518 auto trans, so thats why i'm choosing to go with a vaccum secondary carburetor, i have never had a vaccum secondary carb before, all i have had is mechanical secondary edelbrocks. Anyways i'm open to suggestions but those are the 2 carbs i have narrowed it down too, the quickfuel hr series 680cfm vs or the speed demon 650cfm vs.

I suggest that you buy a carb with as many adjustable circuits as you can afford.
In the above comparison, the Speed Demon does not have as many adjustable circuits as the Quick Fuel Hot Rod unit.
Buying a book is good. I have one from BG and it gave good info, but it lacks troubleshooting details. You don't need a different book for all of the carbs, you just need a book that explains the basics of the Holley "style" (Demon, QF, Proform, etc.) carbs.
The Moparts members are the your best source for carb tuning. We have many members here that can help you learn about your carb!!
If you pick that SD carb, then you might find yourself in a corner (like you are now with the Edy) and you may only be able to tune it so far.

To me, buying a carb with 4 corner idle is good for tuning, but buying a street carb without the replaceable Idle Air Bleeds and the Idle Feed Restrictors will limit your future tuning needs.

Hot Rod Series:
- Vacuum secondary carburetors have a Quick Set housing that is adjustable by simply turning a screw - no more spring assortments to keep up with or torn diaphragms
- 4-corner idle for smooth and efficient idle quality
- Screw-in air bleeds for quick and unsurpassed tuning capabilty
- Screw in idle feed restrictions

QF has the best prices when buying tuning parts. You can buy their parts on Summit/Jegs, or just call them up on the phone and buy the part there. Evey person that answers the phone know allot about carbs. They are a very good carb people. You will not buy a carb From Don, QF, or BG that will run perfect on your car, all year around. You will have to learn how to tune it and you will need tuning parts!!

AED, a sponsor on here sells the best Holley carbs around for the $$--Quickfuel is China parts and castings, Demons are in and out of business 3 times a year --get a bad one ( Very common) and you are toast. An HO HP series from AED is one heck of a carb from folks that take care of customers. Any well built Holley will run circles around cheapo Edelbrocks

I have heard nothing but good things about the AED carbs.
Do they make a vacuum secondary street carb?

I'm just so ready to get anything besides this edelbrock, I hate how there is such limited tuneability on the idle circuit on the edelbrocks, thats my main problem with them. The quickfuel hr series is a nice looking carb with great features.
The slayer series carb from quickfuel is 100 bucks cheaper then the hot rod series but it does not have a 4 corner idle, but the slayer series has the changeable air bleeds and the idle feed restrictions. I am just now trying to decide between the slayer series or the hot rod series both have vaccum secondarys the slayer seres is 300 but no 4 corner idle the hot rod series is 400 with 4 corner idle. And i have never heard of the AED carbs? I will have to check into them.

well i just checked out the AED carbs, They have a 650cfm double pumper with 4 corner idle for 575.00, thats nearly 200 bucks more then the a brand new quickfuel and i think they are mechanical secondary double pumpers.
I really wanna try a vaccum secondary carburetor, never have tried one before, is the quicfule hot rod series carb considered a double pumper?

http://www.quickfueltechnology.com/carburetors-hot-rod-series

The QF Hot Rod Series comes in both styles. Your combo (1991 dodge ram half ton short bed truck with a 4 inch lift and 33 inch tires with an A-518 auto trans) would not do well with a DP carb.

Call Jesse at Bigs Carbs. Will steer you in the right direction.