Edlebrock carb issue?

I have an AVS 650 on an 70 383HP motor, all stock with exception of an RV cam. Everything is new, fresh rebuilt and new carb. With heavy throttle around a corner, the car is either starved for fuel or foods, either way, it dies for a second like a back-fire (without the pop) and goes again. Only happens around a corner, straight line is fine. Any ideas where to start?

i believe that issue is in the manual that comes with the carb. i'll see if I can look it up but think it might be a fuel pressure or float level problem.

Float level might be too high. Depending on your altitude, the stock setting could be too high. An old carb friend of mine and I are at 4000', and he sets the floats lower by about 1/8" for the exact reason you are asking about.

69SKCharger said:

I have an AVS 650 on an 70 383HP motor, all stock with exception of an RV cam. Everything is new, fresh rebuilt and new carb. With heavy throttle around a corner, the car is either starved for fuel or foods, either way, it dies for a second like a back-fire (without the pop) and goes again. Only happens around a corner, straight line is fine. Any ideas where to start?

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Well...I've been through all of that with these Edelbrock carburetors - car runs reasonably well until you want to get into it.

I am assuming that you have the timing set right, that it idles correctly, you have good vacuum, and you do not have the 1825 or 1826 model AVS. If all of that is true, then what I have found with these carburetors is they are factory lean and the Orange step-up spring (5" Hg) is light. Now, if you bought the off-road 1825/1826, the needle/seat spring is heavy. That is designed for off-roading and to prevent flooding in case you are rock climbing, driving on a mountain sideways, etc. For street use, you can drain the fuel bowl and it has to play catch-up, so the spring needs to be replaced. Edelbrock has that part if you need it. I have found Edelbrock's tech support helpful. Give them a call, let them know what cam you have (bigger cam, less vacuum) and the vacuum reading. Remember, before you start changing things, all of it needs to work together - jet size, metering rods, and step-up spring.

Personally, I don't use Edelbrock carburetors any longer. I find using a correctly selected Holley much easier to tune. There are many people in this forum that like and prefer Edelbrock. I had a similar carburetor as you, could not get it to perform well, changed to a 670 Holley. Problems went away. Good luck.

69SKCharger said:

I have an AVS 650 on an 70 383HP motor, all stock with exception of an RV cam. Everything is new, fresh rebuilt and new carb. With heavy throttle around a corner, the car is either starved for fuel or foods, either way, it dies for a second like a back-fire (without the pop) and goes again. Only happens around a corner, straight line is fine. Any ideas where to start?

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I have a 68 firebird, Edelbrock, currently doing the same thing.

lewtot184 is correct, the Edelbrock manual does cover many things..
Also, Edelbrock has:
1. Great Tech help Line
2. Great Videos on You Tube

PS: Anything lewtot184 says "I take it as Gospel"

Great info rlem1977!
Thank you sir!

It is an 1805, not the off road model. Timing is set at 12ish, 18 inches of vacuum, idle is set at about 700. Idle mixture set as per instructions. Also reset the floats to spec, they were low. Maybe that wasn't a good move, but it didn't seem to make any difference one way or another.

and we're only 600 meters above sea level here. I can call tech support and see what they say.

69SKCharger said:

and we're only 600 meters above sea level here. I can call tech support and see what they say.

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I would definately call the techies. My guess is if they agree the carb is the right size, they will recomend the Pink spring. The issue we we had, and I see this freq. is that the secondaries kick in too quick, causing a bog. Plus, it was jetted lean. Might need similar jet size like the 800cfm.

Try this trick first used to happen to me all the time with an Edelbrock carb .Easy fix then after do the next steps people have mentioned these carbs get dirty .
Make sure your timing and idle are set first .
Car not running
There are two screws at the front of the car -air idle screws .
Unscrew them all the way out
With a compressor blow air pressurized down both holes .
On the threads of the screws wipe every thread clean don't lose the springs .
Rethread both screws into carb .
Unscrew evenly out 1 1/2 turns out .
Start the car as you turn the screws the car idle will pick up back up just a bit to not let that happen .
Take car for a drive .
Also for edelbrock carbs a phenolic spacer is a must they get easy heat soak with today's fuel .
After you do this I bet it runs .

Pete Bell68 said:

Try this trick first used to happen to me all the time with an Edelbrock carb .Easy fix then after do the next steps people have mentioned these carbs get dirty .
Make sure your timing and idle are set first .
Car not running
There are two screws at the front of the car -air idle screws .
Unscrew them all the way out
With a compressor blow air pressurized down both holes .
On the threads of the screws wipe every thread clean don't lose the springs .
Rethread both screws into carb .
Unscrew evenly out 1 1/2 turns out .
Start the car as you turn the screws the car idle will pick up back up just a bit to not let that happen .
Take car for a drive .
Also for edelbrock carbs a phenolic spacer is a must they get easy heat soak with today's fuel .
After you do this I bet it runs .

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Need to use a vacuum gauge.