Thanks for the replies. I was hoping they were dates or something. Whoever did the work on this truck last needs to be shot.
Started when Mike L built the trans, it was missing a pump plate inside trans. Now I'm doing injectors, it's missing two injector line locks, 3 valve cover bolts and there is a large blob of silicone in each hole so they were never installed, 2 turbo pedestal bolts finger tight, and stripped allen bolts everywhere.