Help Choosing New Carb

[JRoss22]

So I have finally begun the work on my Challenger and today we hooked it up to the scope at my school and ran into a few problems. The first problem was every time we wanted to start the car up we would have to pour a little gas into the carb. Once we got it running and kept it from stalling out it just wasn't running right, so we started diagnosing it with the scope to find out that only 4 cylinders are firing and the other four are getting spark but nothing happens with them. Started to select which cylinders where to not get spark and when it hit all the odd # cylinders the engine just flat out stalled. So my teacher took a look and started messing around with the carb to find out that its basically crapped out. So my question would be since I am also buying a new intake manifold the Edelbrock performer which would be the best carb to match up for my car? I'm running a 340 and so far have only replaced the fuel pump, sending unit alternator and rubber lines. I don't want something that would be outrageously expensive but preferably I want and edelbrock carb. I wan't to get this all installed into the car and have it back running by next friday.

[MEK-Dangerfield]

Has the car been sitting long, like years? I'm just worried about crud in the tank or fuel lines. That would plug up the fuel filter too. What carb. is on there now? Do you know what size it is too?

  Mike

[JRoss22]

The Car had been sitting until a few years ago. There is no crud in the fuel Lines or the tank forgot to mention I dropped the tank and had it blasted then coated by some shop. Nothing is getting trapped in the fuel filter from what I can see and it had just recently been replaced also. As of right now all I know is that the carb on it is a carter thermoquad cant tel you the size of it because I dont have access to the car as its locked up in the garage at my school.

[MEK-Dangerfield]

Any reason you want to stick with an Edelbrock carb.? I'm a Holley guy, and I think a 650 CFM double-pumper would do you wonders.

  Mike

[JRoss22]

There is no particular reason why im sticking to Edelbrock if I can find a better carb for a better price and its a holley I will go for it. But as for the intake manifold I am already dead set on which one im going to be getting. I am going to look into the holley carb right now and then tell my dad what all is needed so we can order it and have it here in time to start working on it next week.

[71383bee]

Next to the 6 pack the stock 340 intake is probably one of the best intakes ever designed.   For a 340 I would only consider an LD340 or maybe the RPM air gap as an improvement.   

Just pull the intake and clean it out.  If something was caught in the intake ports there's a real good chance that something might have gotten into the heads/cylinders too.  I think that it would be worth it to pull the v/c's and the intake and take a good look at your cam/lifters/pushrods, etc before pouring money into it.

[Bullitt-]

nice price
http://store.yahoo.com/chucker54/aenpemacael6.html

[tactransman]

That is a nice price!

[JRoss22]

Well I ended up just buying an Edelbrock Performer Series 600 CFM carb for about $240 off of Summit. Now I just need to buy some adapters and I will be set to start installing it on monday after I get the old one off. It was awesome though bought the carb on thursday didnt have to pay for shipping at all and they got it to me within 2 days now thats what I call service.

[GoodysGotaCuda]

Well I ended up just buying an Edelbrock Performer Series 600 CFM carb for about $240 off of Summit. Now I just need to buy some adapters and I will be set to start installing it on monday after I get the old one off. It was awesome though bought the carb on thursday didnt have to pay for shipping at all and they got it to me within 2 days now thats what I call service.

Performer is definately much more of a  to tune the secondaries over a AVS, but atleast its a eddie  . I run a 650cfm AVS Eddie, Daily. Rain, Shine, Hot, Cold...fires right up every day, no crap from it, easy to tune, and should be feeding my 318 into high 13s here (find out for sure may 10th  ). My personal experience with holleys havent been good, i've ran two of them with not much sucess. Much too finicky for my liking. We rebuilt a freebie a local guy gave me (rebuilt it with someone with some holley knowledge) and it ran so rich when we broke the motor in there were spots on the street from the black smoke.  . I pulled out a rebuilt 725cfm AFB that has been sitting in the garage for two years and it ran abouta 1000times better than that holley ever hoped of running. Hands down i wouldn't put anything but a carter, eddie, or maybe even a thermoquad on a car i planned on driving much. Is the extra 1/10th or two you might see with a holley worth all the  that comes with it? (again, from my experience) Notta chance.

You bought my second suggestion of carb, 1st would be a AVS only because i know how much i've tinkered with my secondaries to get it dialed in...and comparing tuning the secondaries with a AVS and a Performer/AFB isn't much of a comparison. Regardless you gotta carb that should do you well, same design as the AVS, just the secondaries are operated different.

I'm sure someone will stick up for holleys but you always have your holley, eddie, demon guys...then the GM, Ford, Mopar guys...to each their own. But I think you'll be happy with the Eddie 

-Mike 

[71383bee]

Well I ended up just buying an Edelbrock Performer Series 600 CFM carb for about $240 off of Summit. Now I just need to buy some adapters and I will be set to start installing it on monday after I get the old one off. It was awesome though bought the carb on thursday didnt have to pay for shipping at all and they got it to me within 2 days now thats what I call service.

   Well so much for using your noodle to try and pinpoint what is actually wrong with the motor and pouring money down the toilet. 

A rebuild kit would have cost $50 bucks, you might have learned something, and a nice new undersized shiny carburator is probably not going to fix the problem.  Pulling the v/c's and intake would have cost nothing except maybe a new set of gaskets and I bet even money that your going to end up doing it anyway. 

Goody,

I remeber your issues and your satisfaction with the AVS is probably more to do with the odds that the carb was a better match for your combination than the rebuilt Holley.   I'm not trying to bash on you because you certainly have earned your stripes working on your MoPar's, but I don't think it's right to bash on an entire product because you had a bad experience with it with your particular 318. 

[GoodysGotaCuda]

Goody,

I remeber your issues and your satisfaction with the AVS is probably more to do with the odds that the carb was a better match for your combination than the rebuilt Holley.   I'm not trying to bash on you because you certainly have earned your stripes working on your MoPar's, but I don't think it's right to bash on an entire product because you had a bad experience with it with your particular 318. 

I agree on most of the points there. I tried to keep anything i said about holleys to 'my experience'. only because i do know there are guys out there that swear by them so obviously they work for some people, just didn't work out for me so i went eddie and i was very happy. Sorry if it seemed like i was bashing, just sharing what i've ran into and im well aware that holley guys are out there and theres more thana few 

[JRoss22]

Well the carburetor that I had on the car originally had been rebuilt and the car ran perfectly after we had installed it back on the engine. But some how that carb just didnt cut it. Plus we had already found out that it was infact the carburetor. We adjusted the idle screw so that it was completly closed on one side and it didnt even effect how the car was running then we adjusted the other side and the car started to sputter which indicated that infact it was the carburetor causing the problems.

[Street_Challenged73]

Ah, just a 600 on a 340?!!!!  The original TQ's on '73 340s were rated at 750-800cfm...You probably should have gotten at least a 650 for it.

[torredcuda]

Well the carburetor that I had on the car originally had been rebuilt and the car ran perfectly after we had installed it back on the engine. But some how that carb just didnt cut it. Plus we had already found out that it was infact the carburetor. We adjusted the idle screw so that it was completly closed on one side and it didnt even effect how the car was running then we adjusted the other side and the car started to sputter which indicated that infact it was the carburetor causing the problems.

I`m confused,how did the car run perfectly with the rebiult carb but not cut it?Idle screws having no effect could piont to a vacuum leak or other issues not just a bad  carb.Hopefully the new carb will solve the problems.