Topic: Autolite 4100 Throttle Shaft End Difference

[J_Speegle]

This came up over in the Shelby section, as part of a different discussion, and thought I would visit here with more of a focus.

Discussed the difference with Charles and he offered he had seen four variations but those included service parts also (NOS)

So would like to at least focus on the original assembly line ones if possible

So here are examples of what I found in my pictures. They (so far) have fallen into a pattern with no holes being the earlier version and the lower hole in the later with exceptions which might be a result of a rebuild or a fake/reproduction that got installed on the car


Carb #1  5R09K2141xx




Carb #2 5F07K28180xx Bad angle but appears to be no hole




Carb #2 Reported new take off but didn't list year or plant




Carb #3 Stamped 6Z  C




Carb #4 Stamped 6Z  C




Carb #5 6R07A1590xx




Carb #6 6R07K2040xx Rebuilt but original to the car -Know the car well




Carb #7 6S105x




Carb #8 6S117x




Carb #9 6S120x




Carb #10  6S145x




Carb #11  6S200x




Carb #12  6S208x

[Dan Case]

This version was used in some 1964-65 models including C4OF-AL, C4OF-AT, and C5OF-L.

Shown is a C4OF-AT model for 1964-65 Fairlanes with High Performance 289 engines and High Performance C4 transmissions that I cleaned up for a Cobra (13 each new Cobras used this model carburetor.)