Hi Johan, The firing order can be found in the website's "Repair" section, within the "Electrical" subsection, then either "Plugs and Wires" or "Distributor". Here's a direct link: http://www.imperialclub.com/Repair/Electrical/distributor.htm On that page you'll also find a link to a picture showing how the 413's (and all Chrysler V-8's) cylinders are numbered, as well as how they connect to the distributor cap: http://www.imperialclub.com/Repair/Electrical/PlugWires.JPG Best Regards, Mike Trettin 1956 Imperial Sedan, Turquoise