Actually the 273 HiPo AFB and the Max Wedge 3447S AFBs do have the weighted secondary doors or velocity valves as they were called. Also the '67 HiPo 440 used a AFB not a AVS. I believe Chrysler began using AVS carbs in '68.
I know, thanks, this is what I was getting at without specifically pegging the year, make, models or carb numbers.
Thanks for the exacting information.
I just remember my old buddy Bob G's '67 that had that carb. An AFB without a weighted secondary air door.
