Hi everyone, just like to say i got my z back from vildinimotorsports were they did a great job on my car, Im completely satisfied with the work they have done, but i screwed up on the head gasket (no copper spray on MHG) and it leaks:malebitch. But to get to the point, here is my issue, while in the process of removing the cylinder head i noticed that one of the rocker arm has some scouring marks on it, i know it wasn't there before but i am wondering what caused it, do you guys think i have a bad lifter, or maybe something i overlooked? either way i got a spare block and head for parts so i can just swap the rocker arm and hydro lifter over but im not sure what the problem might be. thanks in advance