Made a copper base gasket out of a old copper water tank.Its 22 thou thick which with a couple of card gaskets as well has given me 50 thou bump clearance.Found a piece of 35 thou copper as well which i have cut to make a head gasket.Ill try it out next time i have the head off.Making a base gasket out off an old head gasket copper was a bad idea.For a start all the holes might compromise the paper gaskets.