I picked up this carb a while back...the guy had a lot of 67-68 440 parts. Any idea what this is from...year...engine...model?
Thx all...

These are the numbers on the RF of the baseplate...
Maybe D8 440 1S?

1968 383 Automatic, D = April, 8 = 1968 assembly date

Thx Scott!! One of these days I'm going to have to learn all of that part of it...

Its an AVS. You can tell from the dimpled covers over the metering rods. AVS's used dimpled because of the three step metering rods. AFB's used flat due to two step rods. 3 step rods are longer than 2's.

I was thinking that Ma stopped venting the bowl to the atmosphere in the 68 + model years for emission regs (you see the bowl vent on top with the black round neoprene cover) but the numbers dont lie. Yes convert it eddy 2 step rods/shorter pri jets & I'd start with the cruise step several tho smaller than what the 3 step rod has now. Fill the metering rod caps with JBweld then cover em with scotch tape & invert em so the mud settles flat on the bottom & let em set up like that for a day or so

Most Chrysler OEM AFBs also used three-step rods and the raised covers.

The air horn is the obvious giveaway with the exposed air valve secondary (A.V.S.)

Also note that this is a 625 CFM carb and the adjusting screw is Left Hand threaded. Note also that it is for a High Performance Automatic Car. If it was a 750 CFM AVS, All 4 of the butterflies would be the same size. That is the easiest way to just flip over an AVS and know if its 625 or 750 CFM. As you see here the primaries are smaller. Most 440 AVS carbs are 750 CFM. 68 HP 4-Speed carb would be number 4426S Hope this helps even more.

good stuff!

AVS also all use the spring loaded secondary air valve right at the top of the carb. AFB's used a weighted air valve without the spring tension and it was down low in the secondaries where you could not see it just glancing at the carb. All the AVS had the spring loaded air valve right at the top like that one which tells us AVS stood for "Air valve Secondary" or thats what I was always told. The rubber nipple on the link coming off the acell pump arm is for the external bowl vent which would be open at normal idle and would close as soon as the throttle was stepped on to make it a balanced carb using the internal air horn bowl vent when driving along. Ron

There's also an "AVS" cast into the side of the carb body, but everything you really need to know comes from the number stamped into the front passenger side foot. In this case it's a 4401.
The number lists will tell you the rest.
R.

Don't suppose you're planning to crack that thing open any time soon? hint hint

I'm trying to put my AVS back together and am not quite if the float clips that came in my kit are the right ones. Love a look inside that thing if you get curious and open it up. Here's a link to my post on the topic showing what I need pics of.

https://board.moparts.org/ubbthreads/ubbt...ght.html#UNREAD

Few tips in the event you do take it apart.
Take the metering rods covers off and the rod/piston assys out first so you don't bend the rods putting the top back on afterwards. Top goes back on THEN the metering rod/vacuum piston assys drop back in after that. And snap a few pics of the linkages outside b4 u disassemble it and then the inside b4 you start taking the guts out. Its much easier to put back together that way. (as in I SHOULD HAVE done that...LOL)

Thanks,
Dave

No real plans for it now. It was with a lot of parts I bought back in the fall. It ended up in the toolbox on my truck and I completely forgot all that stuff was even there. I never know what I'm getting into next so I'll probably keep it.

Thanks anyway. I'm sure someone will come up with a pic...or I'll just pinch the clips a bit and hope it works out.

Here's a link you might like. Full list of Carter carbs and parts with exploded views. Everything xcept those clips of course...they don't even appear in my paper instructions! Guess there's no Chinese word for float clip...LOL!!!

It's a PDF file so it takes a minute to load.

Carter carbs - exploded views-parts list - WALKER

Don't worry about the clips,it will work without them,in 90% of the carbs I get for restoration the clips are long gone.

Can I jump in with one please? I have am AVS I got in a group of parts a long time ago. Best I can tell it says L0 4966S. Looks to be 625 cfm according to the post above. So would that be December of 1970 date code?

4966s is 1971 440 auto non hp
625cfm is a good guess. It's definitely the smaller of the 2 versions.

As Moparjunkyard stated on p1 of this thread, the AVS with equal butterflies on all 4 corners is approx 750cfm but numbers were never officially released.

Thanks for the info. This one does have smaller primaries.