I'm not 100% sure if it caused me to bend a valve or reving to 8k on stock cams did. I had that valve bent and a few other that were tweeked. My friends car did something like this but his got into the motor. I had to fish it out with a magnet with the head still on the car. I told him to take the head off but he started it up and said ohh it's fine lol. Wrong it drove fine for about a day then it wouldn't start anymore. I never found out how bad it was because he was a Rtard and sold the car with the motor for 1k to some guy who fixed it.