My car has SVO X303 heads on it. I dont really know anything more about them. They came on the car. I also dont know what cam is in it. The car has decent pep in its step, and with the 3.73 gears it will light um in a rolling second gear stomp! Once I get to the point where I want to tear the motor down for a rebuild and freshen up I was going to look into the pros and cons of having the heads redone vs looking for something better.