I’m sorry

['68OrangeSunshine]

Originally Posted by RichardJ

>>some of the AFBs had 3-step metering rods,<<

Actually, only the Carter AVS carbs used the 3-step rods. That includes the newer Edelbrock AVS carbs that are also the 2-step rod design.

>>Each of those carbs was calibrated for a specific engine,<<

Not as critical as some might assume. I have a 1970 383 Mopar Carter AVS on my 292 six and it works just fine with no jet changes. I did change the springs on the vacuum pistons above the rods. Its been on there about 17 years.

I found an AVS carb in a junkpile on a movie set. [Mid 1990s.] A set dressing prop from an abandoned 76 Unocal gas station location, supposedly in a post nuclear world. Bad guys were supposed to chase the hero around the gas station. He escapes by getting inside the big orange 76 ball, and rolling away inside it. Scene was cut from the script and never shot, after we built a whole fake gas station, in a parking lot. The carb would have been tossed out after wrap. So I gabbed it, as any Carter 4 barrel was interesting.

Turned out to be for a late '60s Mopar 440 from the numbers. Someone had played with it, however. The primary jets were in the secondary position and the other jets were missing. Also the secondary area had these perforated tubular probes, not annular rings. The jets were these deep cups. The 3-stage metering rods looked shot. [Worn and grooved.] New AVS 3-stage parts are inobtainable.
When Edelbrock came out with the Thunderer AVS, I bought some fresh Edl- parts for it, but nothing came of it. The project lost my interest when I couldn't find any information on AVS tuning.