Matt you are very nieve if you think over 600bhp motors aint linered probably only Karls if he took that at full power on a track day it wouldnt last long imo...i can tell you this ALL my engines are linered and the metal is stronger than the original block...i WONT crack my block in the bores FACT.
nikasil linered...is just a better grade of material than mine...but then i dont run 600 plus bhp!....also your looking at 3 times the cost.