Can someone tell me the size and pitch of the threads in the head for header bolts? The threads on my passenger side are F'd up. They are not messed up too far into the head, but enought that i'm scared. The drivers side header is bolted up and I took a bolt out to double check everything and it looked ok. I don't know how the passenger side is so much trouble. Hoping I can just use a tap. If that doesn't work I don't know what to do outside of a new head.

 

M8x1.25. You can use helicoils to repair damaged threads.