Carb Issues

[sax69]

Does anyone have a suggestion on a carb replacement to the original AVS on a stock rebuilt 383 auto?
The AVS starts and runs fine until I put my foot in it. It dives, backfires a bit and when it does come out of it just does not seem strong at all. Put an electronic ingnition in it last year thinking that was the problem to no avail.
Current AVS is missing some of the choke parts and I think it may be time to look a different way. I would like something I could bolt on and with minimal adjustment get running well.

Thanks

 

[ACME A12]

Does anyone have a suggestion on a carb replacement to the original AVS on a stock rebuilt 383 auto?

One of the smaller CFM (600-650) Edelbrock Performer or Thunder carbs would probably be the closest thing to a direct replacement as far as new carbs go.

The AVS starts and runs fine until I put my foot in it. It dives, backfires a bit and when it does come out of it just does not seem strong at all. Put an electronic ingnition in it last year thinking that was the problem to no avail.

Have you gone through and checked everything else before assigning complete blame to the carb? Fuel pressure, fuel filter, timing, advance curve, etc.???

Current AVS is missing some of the choke parts and I think it may be time to look a different way. I would like something I could bolt on and with minimal adjustment get running well. Thanks

You could always have a reputable carb shop go through the AVS and get it back to 100%. I'd rather have the correct, original carb in perfect working order than a new non-correct one - but that's just my :cents:

Ray

 

[Roadcuda]

I have a Carter 4682 AVS on my car because like Ray, I want my cars to look stock whit the correct parts. It runs fine whether I'm driving easy or clearing it's throat. As Ray said, have someone look at it and get it 100% and I'll bet it will be fine!

 

[Big John]

I'll bet the air valve on the secondary is adjusted so it opens too fast.

 

[mannye]

Just my :cents:

I actually went the other way because the Edelbrock equivalent to the AVS is far inferior to a well tuned OE carb. My prediction is that you will be disappointed by the Edelbrock replacement, or at least underwhelmed.

I would give your carb, as others have said, to a reputable rebuilder and see what happens. If you're not happy after that, I'm sure there will be someone waiting to buy it for more than you spent on the rebuild.

 

[SomeCarGuy]

Could be a weak accel pump.

A good rebuild might be just the ticket. I think the Eddy carbs are good except the 1407/1411.

 

[mike mal]

Send it to Steve's carburetors in Lyndhurst, NJ

 

[sax69]

Thank you for the help fellas.
After reading your posts I have decided to try and get the AVS running better, and looking at the posts it seems that the logical culprits would be the accelerator pump or the flapper for the secondary.
I took the top of the carb off exposing the floats and such and examined the accel pump and all seemed well here.
There are three places to hook the linkage to the accel pump. I assume each hole changes how much fuel is pushed and I will experiment with those settings.
manually priming the pump does sould like it is working.

I think the other mention in the posts refers to the amount of spring pressure that is required to open the secondary flaps.
The pressure seemed very light to me so I increased it a little. Is there any science to this or is it all experimenting?

Snow and cold here so I don't even want to open my garage door right now.

Thanks for your help