What's the diff. between an AVS 4429S and 4618S?

[375instroke]

4429S is for '68 440HP, and 4618S is for '69 440HP.  Did they do a step rod or jet change?  What would be the difference?  Any reason to pass up on a 4429S if I have a '69 R/T?  There's an Edelbrock on it now, and it's got to go.

[Ghoste]

I don't know for sure what the differences are between the two years but with the emission rules beginning to change at that time you can almost bet it was to lean things out a tad in the fuel calibration.  Since you say the Eddy has to go though I did want to add that if the Edelbrock has to go because youdon't like the way it performs you are aware that the Eddys are nearly exact clones of the old Carters right?

[375instroke]

The previous owner used the AFB style.  I think that's all they had at that time.  I hate the look how fast I am pseudo polish.  The Chrysler linkage conversion, or whatever is done, just doesn't look quite right.  It also needs a rebuild.  I know that at least the accelerator pump isn't working, and who knows what jets are in it.

[Ghoste]

Okay, I get where you're coming from now.  I don't think I'd be too worried about using the 68 carb.  I did a quick check and it actually appears like the 68 has the leaner jets of the two but just on the secondary side.  I don't know what the overall calibrations are though.

[375instroke]

I have a '68 and '69 FSM, and can look them up, but I'm wondering what else besides just the specs could be different, and what effect they had on the engine.  My motor is stock except for the carb, so I guess I'm wondering if the '69 specs would be a refinement, or a compromise for emissions.  GM started using smog pumps in '67.  How did Chrysler get away without using them up through the mid '70's?

[Ghoste]

Better engineering.    Seriously though, they all just took different approaches to it.  That's why I was surprised that the 68 had the leaner jetting on the secondary side than the 69.  I suppose it's possible that with 68 being the first year for it they found it needed some fattening up for the next year?  I'm only guessing though.

[375instroke]

Got the accelerator pump working, but there is still a bog.  The initial stomp is fine, but then it falls down for an instant, then picks up.  With the AFB, there is nothing that I can think of to fix this.  The carb is just too small for this motor.  Too bad Edelbrock doesn't make the automotive carbs in a finish like their marine versions.  I'd probably buy one then.

[268RTs4ME]

If you decide your not gonna use the 4429S I am looking for one. lbthatsme@yahoo.com

[268RTs4ME]

Also have a 4640 off a 69 440

[375instroke]

I checked the part number of the Edelbrock on my car.  It's a 1405, and it's only 600CFM.  Why would someone put this thing on a 440 Magnum and throw away the original carb?  Retards.  Glad they can't do any more harm to it.

[Ghoste]

The original was only about 625 wasn't it?

[375instroke]

What size was the 383 AVS?

[Ghoste]

Good question.  I thought all of the AFB and AVS carbs that Mopar sourced were around that 625 mark but this is one of those things where my dimming memory always fails me.

[375instroke]

The secondaries are 1-11/16".  The small carbs have 1-7/16" primaries, and I think only the 440HP motors have 1-11/16" primaries, so they must flow more, therefore the previous owner "upgraded" the car with a smaller carb that bogs.