Norm
Just ignore the previous post by PB. Someone should notify his aid he escaped from his room again.
A head bolt holds the rocker tower to the top of the head. Just pull that thing and clean it and it's hole up really good like and coat the bolt threads and head with light coat of oil. Make sure no oil is between the bottom of the rocker tower and the head. Put the small rocker tower bolt in place but tighten only after the head bolt. Clean the small bolt in same manner.
Torque it.
BTW when you remove a head it's generally ok to reuse the bolts. The gasket kit will contain a gauge to measure the stretch.
__________________
1990 D250/1992 D250 Modified by **Smokehouse Diesel** Ashland, OH
....therefore, my brothers, I want you to know that through Jesus the forgiveness of sins is proclaimed to you. Acts 13:38