Hello. I have a 1980s YFM80 that has a damaged valve seat. There is some light scoring on the surface of the seat where the valve sits and will need to be re-machined. I don't want to spend a bunch of money on new guides or a cnc five angle race valve job. I just want the intake seat machined and that is it. I will be re-assembling the head myself with new valves. What is the best machine shop for this type of simple valve job service? The cheaper the better! I am fixing this engine so I can resell the quad in running condition. I am willing to ship the head wherever it needs to go. I am in south central PA if anybody knows a shop in the area I could check out. Any advice would be great!