I know that the first few Z/28's had a 4P code instead of the 4L code, probably implemented about last week of Jan 67.

What is the earliest documented 67 Z, which would obviously have the 4P code?

Lynn Bilodeau

How about Jon Mello's Z28 #1 (http://www.yenko.net/ubbthreads/showflat.php/Cat/0/Number/104748/an/0/page/2#104748)?

Thanks. Looks like the first one was built 12-29-66 and the next 16 all on 12-30-66.

Lynn