I was at my mechanic today and had my transmission fluid and fuel filter changed. I told him that when I changed my back passenger side coil that there was oil on the spark plug. He said that the valve cover gasket needed to be changed. I am ok with that, but he told be that he has to order them from ford and they are $60 a piece and the total price would be $450 to change them both out. Is that a normal price on the LS for a gasket change? He told me on a Chevy 350 engine it is only $60 for the whole deal. Is our car really that big of a pain? The mechanic is reputable as far as I know and our family has used him for a while now. Is this something I could do on my own? I am good with tools, not a professional on engines by a long shot though.