hi friends i'm doing some work near my maserati qp 2005 duoselect, looking at the cylinder heads from below i realize that the rear leaks oil from the tappet cover gasket and removing a spark plug i found ilio accumulated there too.Now in various sites i found some kits to overhaul the tappet cover but I don't know which one to choose since I don't know which kit is complete to carry out this work according to the rules of art, then since I have to do this work you can tell me if there are any improvements or defect recall to be carried out in those parts .Thanks