I had a good running S54 but took it apart for upgrades. I bought everything besian had to offer for this engine and installed. At the same time I pulled the head, got a machine shop to rebuild, installed both intake/exhaust schrick cams, supertech valve springs, DLC followers and did a full valve adjust. Now I am getting a horrible rattle at 2800rpm right around the vanos area, feels like a vibration as well. I took valve cover off and double checked everything i could, really stumped. It didn't sound like this before.

I know S54 have a bit of a rattle in that range and wondering if the cam/spring upgrades could just make it louder. Any ideas?