I use the rope method. I remove the rocker arms so both valves are closed. I have a 2 foot long rope. I push in about 1/2 of it, if it doesn't go in turn the crank counterclock wise until it does than turn clockwise until it stops. I use this shaft mount compressor http://www.manciniracing.com/ben2pivaspto.html and remove the valve springs. I like this method because I don't have an air hose hanging over the fender, and there is no way the valves could fall in the cylinder.