440 head noise. Perpetual problems. Problem solved

I took the valve cover off and checked each on by bumping the motor and seeing if I could push the rod down and they are all right. It has great oil pressure. The car has tons of power even with this problem. I don't know where to look next. The sound is definitely coming from the valve area. I crawled under it and even had my neighbor come and asked him and he pointed to the valve cover.