Need help decoding 4-bbl Q-Jet carb Mfg. by Carter

[John Brown]

Got out old 1975 Carter catalog for this one. 6170s is a service replacement # carb to replace Q-jets on 65-67 Chevrolets, Chevelles, and Camaros w/396",427", all transmissions. Carter started using the 6000 series numbering in 1971, so the D2 is most likely April 72. All the Carter OE carbs I have seen that were built for assembly line installation used the same numbering as a Rochester built carb, except the first two #'s (70) weren't stamped on the pad, indicating a Carter built carb. They also had the Carter logo, not the Rochester logo. Can't find my Carter kit book, but they used the same kits as the Rochester built carbs. This will take some "eyeball" matching up, since the float design/pivot length changed in middle of 1967. There were also changes to needle and seat at the same time. Look at the difference in the floats and needle and seat, then go with a kit to match the float/ needle&seat combination. LOL