today i replaced my valve cover gasket, while tightening the bolts, i broke the head of a bolt off by overtight, ening, Any suggestions on how to remove it and repair the threads, its not leaking oil from the area so should I just leave it be

i broke one when i replaced my gasket, I removed it by using an easyout. I have never replaced it, and i don't have any leaks

I just took all them out and replaced them with normal M6x 1.25 SS bolts or whatever the size is.