[402Bowtie]

68 chevy
8B141944 = 06/10/68 - 06/30/68 (post 301)

72 Blazer
2F160356 = 03/22/72 - 03/31/68 (post 301, Blazer) 82nd day of 1972 = 3/22

70 chevy
0B132178 = 01/22/70 (post 301) The engine build date (01/27) is later than the truck build date. If that was a common occurrence, that blows a hole in how I have been calculating many of the build dates.

68 chevy
8A134633 = 01/10/68 - 01/31/68 (post 301)

72 chevy
2S186001 = 05/01/72 -05/16/72 (post 301)