Autolite 2100 casting no.'s
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Cross-Country
Joined: Feb 2023
Posts: 60
Likes: 16
From: plains of SD
Autolite 2100 casting no.'s
I just picked up a used Autolite 2100 1.23 venturi carb and have looked everywhere (almost) and can't find any info on this. Directly below the 1.23 on the side of the carb still within the circle is embossed in capital letters "TR". So it's 1.23 over TR, all inside the circle on the side of the fuel bowl. There is no tag on the carb but the no.'s stamped on the front drivers side leg are 9T-J which I think dates the carb to 1969, and from what I've found looks like was used on the 360 and 390 engines with manual transmission?
Any info on the "TR" cast directly below the 1.23 would be very interesting, as I have never seen this before on any 2100 or 2150 carbs and it's got me curious to say the least. Thanks to you guys and gals in advance!
Any info on the "TR" cast directly below the 1.23 would be very interesting, as I have never seen this before on any 2100 or 2150 carbs and it's got me curious to say the least. Thanks to you guys and gals in advance!
Last edited by elbow grease; Jan 17, 2026 at 05:43 PM.
Mountain Pass
Joined: Sep 2004
Posts: 127
Likes: 29
From: s/e iowa
here is an old post from a different forum. 64 tboltd says the "tr" indicates a truck carb.
64 TBOLTDiscussion starter
3,546 posts · Joined 2001
#6 · Oct 25, 2002
The 1.23 is the venturi size,TR is truck.The date code is on the foot(8T AZ).There was also a 1.33 that was in 66 only.This one is going in the ACID tank
64 TBOLTDiscussion starter
3,546 posts · Joined 2001
#6 · Oct 25, 2002
The 1.23 is the venturi size,TR is truck.The date code is on the foot(8T AZ).There was also a 1.33 that was in 66 only.This one is going in the ACID tank
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Cross-Country
Joined: Feb 2023
Posts: 60
Likes: 16
From: plains of SD
Thanks for that, actually I have seen that post but it really doesn't make sense to me as there were TONS of "truck" carbs put out in the '50's-'80's that don't have "TR" cast into the side of the fuel bowl.
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