I cleaned and deburred my EJ251 heads and also had the valve repaired and checked for compression at an official workshop. The heads looked amazing, so shiny and fresh. Unfortunately, my mechanic reported that one of the two cylinder head gaskets was defective and after installation showed me where it was defective. They replaced it and installed the same head gasket twice, which cost me extra labor and $60 for another gasket. In other words, I ended up buying three and paying to install three,