Best RTV to use is "The Rite Stuff" pressurized cheese wiz style RTV. Use this on the the seal inserts until it completely ozzes out front and back. Its expensive stuff..available at NAPA..but its one of those..you gotta pay to play.
Also helps to use a lot of brakecleaner on the cap and block surface since rtv doesnt stick to OIL.. yeah yeah..where was I when the pages were blank.