6 bolts are 89-92.5 like slow mentioned earlier. ANything above is a 7 bolt. Crankwalk is most common on 95-99 (maybe more on 95-97 only because they are older, CW takes time to develop). It can happen on any 4g63, but is rare on 1g's (maybe 1-2%) 2g gst/gsx's are more like 15-20% now. Roadrace has a huge document on it, the whole thing I have read a while back. My first talon was starting to crankwalk as soon as I installed the act2600 because it was adjusted wrong. Then it was stolen. Now my eclipse crankwalked at 80k miles (about 10k miles were mine) on the stock clutch. I did a 6 bolt swap with 2g head/2g pistons and havnt had any problem with my act 2600 for 40k miles so far knock on wood.