How could heat take chunks out of the valve? Not that I don't believe you, I just want to understand better.

The motor has been rebuilt and the only problems were stated above (2 valves and a stiff piston). The rest of the motor look brand new.

My first thought was that the car ran lean. The only thing that made me think diff was the fact that I have been runing that same set up for well over a year. Nothing was changed.

But then again shit happens..........2 me

No more nitrous. Turbo is the next step.