I got these two camshafts when I picked up a B18C1 head. It came with these two cams that I was told were Type-R. I paid about $350 for the head and the cams. What are these things acutally? One has a B and a 7 stamped on it (thumbnail 2 and 3) The other has a C and an S (thumbnail 4 and 5) Since I am at it, and yes I don't know shit, which one is which?