I need some help in picking my new carb. I have a rochester q jet and it isnt cutting it. I have a 355 with 9.5 :1 compression, a comp cams extreme energy 268h cam, auto tranny with stock converter and soon to be 3.23:1 gears. I am deciding between a holley street avenger 670 cfm, edelbrock 600 cfm, edelbrock 650 cfm avs, or a speed demon 650 cfm. more than likely I will use a vac secondary carb, so far I like the speed demons fetures the best. That and it looks nice, but with that K&N filter on it I guess it dosent matter what the carb looks like. What have you herd about demons ? are they as good as they are supposed to be? I dont care about the price on this one to an extent as it is one of the most important parts of the engine. all this is in a 79 camaro some drag use, daily driver and its drivin hard. If any more info is needed just ask I dont know what I need to look for in a carb.

Although I`m sure you want to do away with your Q-jet, if you wanted to save some money and still appear stock, the Q-jet will work fine set up properly to your combo, here`s a link that tells how to set up Q-jets for performance use.
http://www.dapa.org/tech_articles/rfrazier-qjet.htm

I run a road demon jr. and I have to say I`m kinda satisfied with it, when the slightest thing isn`t right such as fuel pressure, and so on, the thing is a complete pain in the A** to tune. but once tuned it holds it nicely. If you decide to go with a demon make sure you follow the instructions very carefully, there not like a Holley, bolt it on and turn a few screws and your done. I don`t like Holley`s due to them being cheaply made and lack of quality control.
the edelbrocks are okay, but much like a Q-jet, they use metering rods to meter fuel. so in the end, if you want easy tuneability and good power, the demon is the way to go, but before I bolted it on, I would strip it down and check for drilling trash, I found some in the idle circuits of mine. good luck.

If you want a carb you can setup and leave alone, my vote is Edelbrock ... I just put one on my truck and it's been making me smile a whole lot!

Alan
54 Chevy Pickup

Everyone has a preference on carbs. I would recommend a Holly 750 #3310 with vacuum secondaries. It will open only as much as it needs so it will not be to large. Then it will be big enough if you upgrade the heads or anything else. Why clean a new carb out like a Demon if its new, that tells you something about quality.

__________________
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All bad,haven't you seen the exorcist???Look what they did to Linda Blair!!!
Sorry did I miss something??

demons are just as good for performance and hard to tune 100% as holleys are, they are in effect the same carb, except they have done away with the shortcomings in quality and durabillity of holleys, but all the small parts (jets, powervalves etc) intarchange 100%, i personally like edelbrocks as they tend to make for a smoother running engine, BUT its no race carb, if you cplan on rinning a holley type square bore go for the demon, but what about an all new edelbrock performer rpm spread bore?? it will also bolt straight to your carb..


just a thought

Ok so I need bigger, so I figure 650-750 should work out well. I dont plan on doing much to my heads as they alredy out flow all stock chevy heads. I have a weiand 8004 manifold so I can use either a square bore or spread bore on it I have thaught about another spread but then why not just modify my Q-jet insted? I like the adjustiblity of the demon and holley over the simpler edelbrock, and I plan on having a good local shop tune my carb for me so I dont mind the extra adjustments. The way I see it the more you can adjust the better suited the carb will be for your engine. would a 650 or 750 better suit my cam, heads and gears? I see where 1bad80 is coming from on the it will allow fuel flow as needed thing. but too big is still too big. I cant afford to loose much low end torque. thanks for your input keep it coming.
P.S. I have world products S/R torquer heads 2.02 1.6 manley race-flo valves.