D^2, The 4966S carb is an AVS. I know that it was used on 1971 440s, including the one in Imperials. I think it's a one year only carb, because it doesn't show up in the 1972 Master Parts Catalog. Pete in PA With a 4966S fitted to his 70 LeBaron Oh, I'm looking for another 4966S carb to replace one with seized idle mixture screws. Let me know if you want to sell the carb. From: dardal@xxxxxxxxxxxxxxx Subject: IML: My AVS numbers, was: Carburetor Problem Date: Sat, 08 Mar 2003 10:13:42 -0600 (CST) Reply-To: mailing-list@xxxxxxxxxxxxxxxx All you guys with the books, here is the info. My AVS from the front it says K496BS or K4966S (can't tell for sure, the letters are not defined very well). Again, this is at the lower flange face in the front of the carb, towards passenger side. On the left side (driver side) it says 2046 and on top of the carb it says 2020.