ARE  THE VALVE COVER STUDS  (4 OF THEM) SUPPOSED TO  SCREW INTO THE CYLINDER HEAD THROUGH THE ROCKER ARM BRACKET OR ARE THEY JUST THERE TO HOLD ON THE VALVE COVERS?  THEY WAY I FOUND THEM WHEN I TOOK THE ROCKER SHAFTS OFF IS THAT THEY WERE NOT BEING USED TO HOLD THE ROCKER SHAFT BRACKETS ON  BUT JUST THERE TO HOLD THE VALVE COVERS ON.  SO IN REALITY I ONLY HAVE 6 BOLTS HOLDING EACH ROCKER SHAFT DOWN.  THANKS