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Old 11-20-2008, 09:18 PM   #1
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Carb questions...

Alright so i have a few questions. I have an old 350 with an edelbrock performer carb 600cfm and i have a quadrajet carb with this number 17083204 on my truck right now. I cant find anything information on the quadrajet carb so if you guys could help me find out which one is better i would appreciate it. Thanks in advance.
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Old 11-20-2008, 09:24 PM   #2
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If you're going to be in alot of off-camber positions, the quadrajunk will be better than the edelbrock. The edelbrock can be tuned to be better, but it will starve for fuel alot quicker than the quad. I am not a big fan of the quadrajunks, but they can be good carbs with a little tweaking. The edelbrock/carter carbs are my favorite and imo the easiest to tune.
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Old 11-21-2008, 11:07 AM   #3
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My truck is going to mainly mud so i think i am going to go with the edelbrock. Can anyone tell me what cfm my qudarjet carb has? I can find it anywhere.
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Old 11-21-2008, 01:14 PM   #4
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It depends on the particular carb numbers and such, and what vehicle the carb originally came in. They were all "factory tuned" for CFM as opposed to the aftermarkets which are a one-size fits all arrangement. I saw a chart once, and the difference was negligible, but a little less than your Edelbrock.

I'd run the Edelbrock as well in a mud truck. It's easier to tune and clean, especially if you end up sucking a big chunk of mud/water in there. Spend the money and buy the tune-up kit for your carb #, as well as the off road needles and seat set. It'll keep the fuel in the bowl instead of splashing around and stalling the truck in a bounce.
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Old 11-21-2008, 08:23 PM   #5
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wanna sale me your Q-jet looking to get rid of my 670 street avenger.
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Old 11-22-2008, 10:59 AM   #6
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Possibly, Just curious but why are you getting away from the aftermarket stuff and wanting an OEM Q-jet? And what engine was the 670 on? If i took mine off could i just throw that one on and go? Only reason i ask is the truck is my daily driver and i cant have it down very long.
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Old 11-23-2008, 12:58 PM   #7
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My truck is going to mainly mud so i think i am going to go with the edelbrock. Can anyone tell me what cfm my qudarjet carb has? I can find it anywhere.
735 cfm
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Old 11-24-2008, 09:20 PM   #8
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skullcrushers truck dies on off camber stuff and hills.
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Old 12-03-2008, 05:57 PM   #9
 
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My q-jet sucks when mudding. It stalls out and absolutely no power at times. I would rather get an aftermarket edelbrock carb since i already have a edelbrock intake. Trust me you won't regret switching to the edelbrock. I already went through 1 q-jet but since i got the 2nd one free it will have to do till i get a edelbrock.

Skullcrusher's carb dies and that's a street avenger...I wouldn't expect that to happen. Mine just looses power and sometimes dies too. I'm not sure about these carbs but if i could I would like to try a double pumper and see how that works. I heard they suck gas like crazy but sounds like it would be better for offroading. Anyone have one on there rig?

P.S. I have video of my truck and you can tell how seriously it looses power with a Q-jet while mudding.

http://www.youtube.com/watch?v=S9xTB1YR8qc
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Old 12-03-2008, 07:54 PM   #10
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i have an Edelbrock performer 650 carb (#1405) on my 350 (75 K5) and it completely sucked on hills/inclines. i then bought and had installed the Edelbrock spring loaded needle & seat kit (#1465) and although this helped out alot, it still leaves alot to be desired. it still dies but it takes more of an incline to die. just the same, im not gonna recommend that carb. save the $300 and put it towards a $1000 propane kit and youll never be sorry. thats my plan at least
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Old 12-03-2008, 08:04 PM   #11
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My q-jet sucks when mudding. It stalls out and absolutely no power at times. I would rather get an aftermarket edelbrock carb since i already have a edelbrock intake. Trust me you won't regret switching to the edelbrock. I already went through 1 q-jet but since i got the 2nd one free it will have to do till i get a edelbrock.

Skullcrusher's carb dies and that's a street avenger...I wouldn't expect that to happen. Mine just looses power and sometimes dies too. I'm not sure about these carbs but if i could I would like to try a double pumper and see how that works. I heard they suck gas like crazy but sounds like it would be better for offroading. Anyone have one on there rig?

P.S. I have video of my truck and you can tell how seriously it looses power with a Q-jet while mudding.

http://www.youtube.com/watch?v=S9xTB1YR8qc
I had a Barry Grant built 830cfm Holly and it would not even load on the trailer,worked great on the steet though...

from what I can hear in that video it sounds like it's more than just a carb problem, what the fuel pressure at the carb? what is the timming set at?
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Old 12-03-2008, 08:21 PM   #12
 
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I don't have a regulator/gauge but yeah i guess fuel pump was an original ...i just replaced it 2 days ago after it stopped working. Will find out how well the new pump works later.
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Old 12-03-2008, 10:31 PM   #13
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Ditch the carb and go FI or propane. That's the best mod I've ever done on my K10. I was constantly having carb problems and always having to adjust them. Out of the q-jet, edelbrock and holley I ran the edelsuck was the worst one of them all. Any little bump would cause it to flood out and die. The holley when on the 350 wasnt too bad, but I mostly ran wide open on the sand dunes. I ran the holley on the 454 for a while and only had problems with it flooding out a couple times while crawling. It finally got to the point that no matter what I did I couldnt keep it from running rich. I switched to TBI and now it runs great and only dies when I stall it.

The s10 has the factory vortec system still. I have laid it on it's side and didnt have enough fluid to run the tranny or oil pressure, but it was still running.
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Old 12-03-2008, 11:20 PM   #14
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I don't have a regulator/gauge but yeah i guess fuel pump was an original ...i just replaced it 2 days ago after it stopped working. Will find out how well the new pump works later.
you need 7 psi for the q-jet other type carbs need less psi like 4.5 and more volume. in drag racing you need more psi at the back of a car to compensate for the inertia at launch. if your timming is to slow it can rob you of some horse power too. are you running an inline fuel filter or still have the one in the carb?
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Old 12-04-2008, 10:09 AM   #15
 
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Still have the one on the carb. I guess if i keep the truck i'll really be doing some serious modding to it. Still have some hedders and 40 series dual flowmasters just sitting around. So would a in-line fuel filter be better off?
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Old 12-04-2008, 10:19 AM   #16
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When you say fuel filter at the carb are you talking about one that you can see just outside the carb? Im sorry if this is a stupid questions but i have zero experience with engines and carbs.
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Old 12-04-2008, 10:39 AM   #17
 
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Where the fuel line ends on the carb there is a nut that holds a tiny paper filter in there. If you loosen that there will be a filter inside. If you ever replace it..always take the old filter to the auto parts store since most carbs have different size filters and most carbs aren't the original on that motor.

If you can actually see the filter outside the carb..that would be an inline filter meaning its somewhere connected to the fuel line before you get to the carb. Some have a clear housing so you can see if its clogged or something.

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Old 12-04-2008, 11:02 AM   #18
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Mines right out side the carb...
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Old 12-04-2008, 03:53 PM   #19
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if your running the quadrajunk, you should have a filter at the carb. it doesnt look like a filter, but if you undo the nut/fitting at the end of the fuel line there is usually one in there ( like RUDYT5000) said. check and make sure you dont have one, if you do its prolly ready to be replaced and they are fairly cheap and easy to do
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Old 12-04-2008, 07:40 PM   #20
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The street avenger problem probably has to do with the float level, if you can see the fuel level in the sight glass without slightly shaking the vehicle they are too high...
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Old 01-02-2009, 02:25 PM   #21
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I've heard some good things about the holley T/A carbs as far as hills and such go. If it were me I'd buy a jy tbi setup and piggyback the wiring harness and have fuel injection for about 150-200 bucks. I know you have to have an electric fuel pump too but its not that hard to do. Thats what I'm doing on my 350 anyways. Theres alot of good info on the wiring on binderbulletin.
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