Others may know more than I do but I have it that 'early' 1927 engines started with # 2,874,999 in December 1926; there was then a change on June 7th 1927 to a new Cylinder Head [32 b.h.p. type] at Engine # 3,409,976 except for Engine # 3,410,101 to # 3,415,520, the motors having a new type of Delco-Remy semi-automatic Distributor [mechanical flyweight as against a spring advance] which was mounted as before but required a different method of timing, as well as a change to a larger Carter carburettor, a Carter C-RJX-0, as compared the previous model 1-inch C-RX-0. The exception motors we now know were for export.
1928 Selling Season or Late model engines started at around # 3,557,001 and finished at # 3,863,595.
I have it seems data for 1927 cars and commercials but as you have only asked about cars:
1 JANUARY 1927> / 1 AUGUST 1927>
1AA-1001 to 1AA-81763 / 1AA-81764 to 1AA-103744?
2AA-1001 to 2AA-79094 / 2AA-79095 to 2AA-108456
3AA-1001 to 3AA-128735 / 3AA-128736 to 3AA-
6AA-1001 to 6AA-44695 / 6AA-44696 to 6AA-55250+
9AA-1001 to 9AA-44695 / 9AA-44696 to 9AA-
12AA-1001 to 12AA-68390 / 12AA-689391 to 12AA-70000+?
21AA-1001 to 21AA-71646 / 21AA-71647 to 21AA-
22AA-1001 to 22AA-? / 22AA- ? to 22AA-?
Plant codes:
1 FLINT, MICHIGAN
2 TARRYTOWN, NEW YORK
3 ST LOUIS, MISSOURI
5 KANSAS CITY, MISSOURI
6 OAKLAND, CALIFORNIA
8 ATLANTA, GEORGIA [APRIL 1928 ON]
9 NORWOOD, OHIO,
12 BUFFALO, NEW YORK
21 JANESVILLE, WISCONSIN
22 TARRYTOWN CHASSIS/COWL FOR AUSTRALIA, URUGUAY, etc.
