Ive made a post before about this but dont think I got quite the answer I was looking for. My gsr head has a bunch of stripped cam cap bolt threads and heli coils just dont hold like I need. How can I repair this problem and is it really cost effective? Ive got some head work into my head and really dont want to start over from scratch. I have heard of (time serts) or something along those lines. Who can even repair this if needed???

thanks