I've got 2 cams in my possession that I have no clue what either of them came out of. I was told one is an LS1 cam and the other is possibly a 3rd gen cam of some sort. Maybe one of you can help me determine that.

Here's the castings I found on them:

Cam #1: 242 GMPT BC 15 "F"

Cam #2 643 CPPC(?) BC 4 "D" or "U" (can't make it out clearly)

Nobody?