There are reasons to believe the 837 M22 L78 number includes COPOs. Internally, COPO build orders mention L78; it is listed on Canadian COPO documentation. COPOs 9560 & 9561 were not RPO and didn’t exist for statistical purposes. When the YTD totals were rolled up all COPO data was likely assigned to L78. When I apply what is known about production totals [and factoring October] it looks like this:
L78 – 690
COPO – 178
Total SHP BB - 867
Z/28 – 1,250
Total M22 – 2,117
The trans production number that has been long thought to be FUBAR is the M21 total of 26,501. There is no way to get anywhere near that number; the total production for all cars that could have had an M21 is 28,159. Subtracting 2,117 M22s leaves 26,042. An M20 is not uncommon in a Z/28; a reasonable estimate is 21%. It was also available for all big blocks. While rare in COPOs there have been a few documented. Also, there were 3,692 automatic big blocks built, most probably L34 & L35. I have seen a number of documented M40 L78s. 30 of Yenkos L72 Camaros were automatic as were 22 ZL1s. Of the 1,015 Camaro L72 engines built 193 [19%] were MO coded for an automatic. For these purposes I estimated total COPO production at 950. When all this is factored M21 production comes in at 18,849.
