time serts are what is used when northstar engines pull the head bolt threads, which they do like it is their job. it is a time consuming process but the kit is very trick and it turns out nicely. if you think you are going to be pulling the head alot get a stud kit, most bolts on newer engines are torque to yield so they should not be reused anyhow. just chase the threads , do not Tap them, and you should be fine. like fordified said why try to "fix" something that has not broken?