Is anyone on here running a holley or demon carb. Im thinking of swapping out my edelbrock and going with one of them.

don't you like your edelbrock ?
i got the thunder series carb last spring and i think it works better than my old holly . but hey that just me

I have run many Holleys of many different models and I prefer them. Never ran a Demon but it is a Barry Grant Holley copy and I have heard good things about it. Many people on this forum defend the Edelbrock and I think that their success with the Edelbrock is hard to dispute. Personally I think the Holley Avenger is a perfect carb for a street performance 350 SBC.

i have a buddy that builds engines or use to full time, he is an engineer now, and he has nothing but good things to say about them. He tells me they are much easier to tune and you can get much better power and even better gas mileage out of a holley. He got 25-26 mpg off of one of his set ups .But I myself am still staddling the fence..seems like alot of guys in here run edelbrock.

I think there are reasons why some guys prefer Edelbrock carbs over Holleys. First of all they are generally cheaper. And a lot of guys have had or know someone who has had real bad experiences with a Holley in the past. Much of the time when I talk to somebody who had a bum Holley the story is very similar. Because there are so many different Holleys (literally dozens of different models with hundreds of different specifications) it is easy to get the wrong Holley that just won't work correctly with the engine and conditions chosen. Edelbrock carbs are much more generic; most Edelbrocks will work ok in most situations. The worst case is when someone acquires a used Holley that a previous "expert" tuner has "modified" and is so screwed up it couldn't possibly work on any engine. Holleys are much more precise than Edelbrocks; hamfisted mechanics will always have a bad time with Holleys. But because they are so adjustable and flexible a properly chosen Holley is far better than an Edelbrock.
Anyway that's my opinion.

very true..I hear that once you get one tuned just right they are great. The demons have a visible window that makes it even easier to tune.

I love my 625 road demon! I use my El Camino as my daily driver and the demon runs perfect. I can step up to a bigger speed demon for better performance but I like prefer the better gas mileage at the moment with these crazy gas prices.

I used to have to always adjust and mess with my 780 Holley on my '71 Z/28. The Holley Avenger sounds like they are smooth less tempermental. When and if I do step up it will be with another demon. And hey you can't beat the looks of a Demon, flat out the best looking carb on the market!

I tried a 600 edelbrock and i didn't have any luck.i had problems with flooding, so i returned it and bought a 670 holley street avenger and im realy happy with the way my new holley runs its the best working after market carb ive had yet.

You're right Dave the Demon carbs are very good looking, but with a little work Holleys can be pretty also. Here are a couple of double pump 950cfm Holleys that I modified for the blown big block for my '55 Chevy.
http://elcaminocentral.com/albums/Mrapii-1979-El-Camino/IMGS0136.jpg

I think that once i get this thing running i will make the switch to a demon or maybe a holley...Its gonna be a everyday driver as well ...The less hassle i have to deal with the better

Do you have any other pics of your sweet 55 chevy.

It's a "work in progress" right now. I'll post some pictures of the finished car when I'm done.

I have run many Holleys of many different models and I prefer them. Never ran a Demon but it is a Barry Grant Holley copy and I have heard good things about it. Many people on this forum defend the Edelbrock and I think that their success with the Edelbrock is hard to dispute. Personally I think the Holley Avenger is a perfect carb for a street performance 350 SBC. Personally I don't like Edelcrap. Years ago Edelbrock had it going on, but over the last 10 years or so it seams to me that thier quality controle has went down hill majorly.

I haven't been satisified with my Edelbrock. However that could change very soon (This wekend) I plan on re-jetting it. I get nothing but lean conditions like a constant vacuum leak. I have come to relize that I have the wrong jets which were stock with the carb, that has got to be it, for me. If this don't fix it then I am saving up my cash for a Street Demon 650 CFM. Now I am running 750 CFM. I read an article in Super Chevy with Danger Mouse and they had a Street Deamon 650 on a 500 Hp SBC running sweet! So that tells me they are far better than anything on the market today. I don't know of a "Out of the box" 650 that will work great with a 500 Hp monster other than the Demon.

Holly is a good carb easy to tune and upgrade and works great when you need a 4 corner idle capable carb. Look at what most dragsters have on their engines if you want to see the best. Its not an Edelbrock Carb.

As far as the rest of the Edelbrock line I have a whole engine full of their stuff and its nice. I have the Performer RPM Heads, Performer RPM AirGap Intake and that Edelbrock 750 Carb. I'm just am not satisifed with the carb I need more fuel. "Out of the box" that Edelbrock 750 should have done the trick it should be almost too big for my 383 considering my cam is pretty mild.

JMO

You might be on to something about the jetting on that Edelbrock Pete. The 750 was meant for a larger engine and the jetting is probably too rich but the engine could be running too lean. How is this possible? All carburetors depend on a vacumn signal from the engine to activate the fuel system (ie. pull fuel from the carb fuel bowl thru the jets/metering rods and out the venturi boosters). If the carb is too big the vacumn signal is not strong enough to pull enough fuel to run at the proper A/F ratio and you have a lean mixture even with a big carburetor. I think that the smaller Street Demon will result in a much better running engine.