lets put it this way. What else is wrong. Pull that motor out and either rebuild it or replace it. Unless you want to take it apart a little like take off the head and see witht he pistion walls are like and see what condition it is in. then when you go to replace the chian make sure everything is at TDC. But i would strongly suggest with that year and since it is a z24 just replace the motor or rebuild the one you got