It would seem from recent posts that the Go Tech engines run well at temps anywhere from 200 F up to 260+ F. I am guessing the higher temps mean better power production, but with a reduced life span. Would this be a fair assumption ?

I tune my engines pretty conservatively, as I am fairly new to the sport and don't want to cook anything My two 5 ports (non modified with turbo heads) normally come in after a run at around 105 - 110 C (so around 220 F) when they are running good. This is using 25% fuel with standard restrictor.
Sounds like I could tune a little more aggresively with no worries perhaps