I thought he said Velocity, not HV. These are 2 different beasts altogether.

The 6.5 is a bit much for most SC trucks. A SC10 is a true race bred truck, so it would have the best chance of doing well with a 6.5. But it will require some good tires, a good suspension setup and excellent driving skills.

The 6.5 may also run hot in a SC truck, but I cannot say for sure one way or the other. Some people have had good luck turning down the endpoints on their radios, but it is not recommended. A brushless ESC works by switching the phases on and off constantly. At lower speeds the ESC has to switch more often. At higher speeds its almost like the ESC is "resting", since the power is nearly flowing straight thru it! This is why most companies recommend gearing your vehicle to where you are able to use full throttle for at least a few seconds every lap. Like I said, many people have had good luck simply turning down endpoints, but in theory it can create more heat.