adjusting oil pressure

try this with the gaskets. remove the old ones. tap the under side of the bolt holes to get them flat. apply silicon to the valve covers. sit them on a flat surface, gasket down. place a board on the two of them together. place a heavy object on them, like a brick or something of that weight. let them dry for several hours. apply grease to the gasket surface and install them. bolt them on with criss cross pattern. tighten them has you have been doing.