I also remember way back with the 4 cam corvette came out, GM had to detune the engines because the motor was making so much torque that they where snapping crankshafts. so I'll let you decide how reliable the chevy motors are when you start bumping up the power output. They designed thier engines around the production v8s used in every day cars and trucks, they where never purposly designed for flat out perfomance, even though they can produce big hp numbers, my question is what lasts longer?

German motors are designed to run flat out for longer periods of time, that's why they have an Autobahn.