The first step in making my valve covers was to build an accurate forming jig. I began by tracing the flange of a stock cover onto a piece of 1/2-inch steel plate. If you don't have a valve cover to work from, you could use a gasket, or create a pattern by taking a rubbing off the cylinder head using a piece of heavy paper. Pipe and pipe sections were cut and tack-welded to the 1/2-inch plate for use as forms for the various curves and corners of the jig. Note that the flange mounting holes have been drilled into the plate. A piece of 1/8-inch steel flat plate was then cut and welded to form the straight portions of the jig.