[Plums]

I used to use Loctite super stud lock on the rocker studs and also put a dob of "anti-tamper" paint on them facing the intake, (so I could see if they were moving).... I did this because a mate of mine with the same motor, (308) used to find loose rocker studs after every meeting.
After using the Loctite we never saw a loose rocker stud again....