We reuse head bolts all the time . Some of the motors are 1300 hp. Some stock big blocks. If it says they are reusable then reuse them. Put it this way do they replace the main bolts when rebuilding? No and they are more stressed than the head bolts. You can tell when there is a problem with the bolt as it will not torque properly as the bolt is actually stretching and if you keep trying to torque it ,it will break. Just make sure to clean the threads in the block and the bolt threads so you get the proper torque. shawn