HI all,
This may have been better sent to D2, but since there have been others with
AVS questions lately, it may be helpful to those as well.
Ok, in this case, the number is 4966S. The number with the S is the part
number for OEM carbs, AFB, AVS or TQ. The other numbers mentioned are just
casting numbers or date codes, Im not sure which but I do know the number
with the S is what you need when ordering kits, or looking for specs.
As far as identifying an AVS vs an AFB...heres a couple tips.
An AFB has no spring loaded flap over the secondaries, it has a
conterweighted flap down inside of the secondary venturies.
An AVS has no secondary venturies, just a couple of brass tubes pressed into
the carb body on the secondary side.
As far as its CFM, good luck. As was posted recently, Chrysler and or Carter
did not give an official equation of CFM on their OEM carbs. The newer
stuff is rated at 500, 600, 625, 650 or 750 depending on what brand ( Carter
Performance or Edelbrock ) that you have. Quoting from " Carter
Carburetors, Vol. 2" by Dave Emanuel it says " .....judging by venturi and
throttle bore diameters, it appears that the flow range is between 450 and
625 cfm .."
Looking at this same reference, the most common bore sizes ( about 95
percent of them ) are 1 7/16 primary and 1 11/16 secondary, which are very
very close to the 1.44 and 1.69 that was given earlier by D2. Lastly, and
again I will just quote here " some AFB and AVS carbs were produced from the
factory with single mixture adjustment screws ...."
Someone mentioned about removing the lead plugs in some of these carbs to
adjust the sealed screws, theres no real harm to this as long as you dont
get too carried away with the drilling. Of course, the implication that
you will of course stay within the local enviromental and regulatory laws
and replace those plugs is entirely up to you.
Take care all,
Mikey
62 Crown Coupe
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