I was removing the socket head plugs on my 1.6 Hyundai head and a few stripped and had to be drilled out. Unfortunately this messed the threads up a little so my plan is to go to the next largest size. I can't really use a npt pipe plug because the next size up is 1/4 which is almost twice as big as what came out. I found these on ebay and I guess they are correct. I'm assuming whatever I put back needs to be tapered. Hard to tell if these are or not. Any ideas?