I run 535rwhp in my GTO everyday on a stock bottom-end. Mine is supercharged (13psi boost) w/meth and a very rich tune. I run it hard shifting at 6850rpm and it's holding up very well. Keep the tune rich and you shouldn't have any problems. I have a friend that has 700+ rwhp (APS twin turbo) GTO and didn't have problems (stock bottom) until he lost fuel pressure, went lean and broke the #7 piston ring land. When it was disassembled, everything was in perfect condition. No crank twisting, damaged rods or any damage at all. This doesn't mean there will not be problems at some point with our pistons/rods. If you want to be really safe, you can get a Compstar rotating assembly for ~ $2000. They're excellent parts for the money, come fully balanced and ready to assembly. You would just need to have the block machined and you're ready to assembly/go. |