What is the hp and et record for stock longblock 07-10 gt500's? I saw where evoperformance went 8s with a stock longblock. The et question was out of curiosity. But the hp question wasnt. I am trying to figure out a good hp stopping point for my car. I have an 08 gt500 motor with about 15k miles with a single turbo setup. I have gotten mixed opinions. Some have said 600rwhp and I have seen some make 850 or more, one of those made 849rwhp on 91 octane. I will be running a th400 so I know my rwhp numbers will be different than a 6spd. But im wondering if i can go to 700-800 or what? All opinions would be appreciated.