Howdy Inline6Merc:
Autolite jet sizes varied considerably in 2100s and 4100s depending on vehicle application, model year, location, and (IMHO) what was on hand. Another factor is that it is hard to determine what is original and what is not. I have never seen jet sizes listed by application either. Most have been in the range of 47 to 58. Stock jetting is usually on the rich sideprior to about 1972.
We have gleaned jets from a variety of Autolites and have found very little consistancy.
I can tell you that Autolite Power Valves are rated at 5 lbs of vacuum, and some even measure close to that rating. The good news is that Holley Power Valves can be used in Autolites. Holley PVs are only slightly more accurate to the rating stamped onto them.
If you find any info please share.
Adios, David
