Download the 89 manual for your truck.

Read the post on "how to search". Make sure you set the time interval to 7years, and search only the mitsubishi tech forum. I suggest a post called "Bob's 3.0 engine" by FrankR for the most info in one place. You can't go wrong following Frank's advice.

The torque for the head bolts has changed to 80ftlbs, hot or cold.

Not responsible for advice not taken...