I have a rocker arm in my '03 Century Custom that has stripped out the head. I tried to tap it and helicoil it but unfortunately the tap went sideways. I am thinking that I may be able to drill and tap it out to a larger size. My question is, can I tap this out to a larger size and use an m10 1.25 helicoil with an m8 1.25 helicoil. If not, is there a way for me to do this.