Trying to help a friend out with this post. He changed out the head for more power. Before tear down, the compression was. #1=52.#2=55.#3=52.#4=58. After only doing a lap in of the valves, the compression was.#1=70. #2=94. #3-95. #4=115. The head he installed was a 6-1. Trying to figure out what...