What model carburator is on the GMC Fox Armoured Car?

[Grant Bowker]

According to the C60X-04 parts list, the maintenance manual M660-C1and the service bulletins, early C60X used the Zenith 28AV11 type (also given as 28AVII) while later used the Carter W1-589S dust sealed carburetor. I don't know the Zenith part number but the GM part number was 5814938 and this should appear on the ID disc on top of the carburetor along with the Zenith number (28AV11 is a range, not a precise part number). I don't know the breakpoint for the changeover but suggest it might have been at the start of the 1944 production at the same time as the change in the brake system, T-case shifter, hub slings, moved coolant recovery tank, round gauges. I haven't seen enough original C60X to be able to confirm or deny the use of the Carter.