I have an o360 that has 3hr SMOH. It was sitting in an aircraft on the coast of Florida for what I was told, about 6 months. I kept it in a storage container with the humidity kept very low. I am getting ready to install the engine and decided to take the rocker covers off to take a look. What a disappointment, the springs and tops of the covers have a considerable amount of rust. I have the log book but I am a little skeptical on the quality of work, for one it states new plugs and oil filter, they sure look pretty old to me. Also it seems to be slowly seeping oil from several places.(I do rotate it monthly) Now I think I need to at least tear it down, clean it, inspect it for corrosion and re seal it. I have never been in one these before but have a decent amount of experience with smaller engines. I think I can handle it, I need to find a good manual that will have the information I need, also would like to hear some comments on my situation.