Tough to see clearly but does the subject block casting end in 711 and possibly an <span style="text-decoration: underline">0</span>-326711 Can-Am block?
Here's a thread link where we noted some of the different ZL1 casting #'s here a few years ago.
https://www.yenko.net/ubbthreads/ubbt...286&page=1
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete