Well looking from the front of the engine "where the fan etc.. is" the cylinders are numbered on left side first. 1234, then the right bank 5678. the firing order goes 1-3-7-2-6-5-4-8. So like above the cap should say "1" on it and go from there. "should always lable your wires and plugs" Not saying you have to but it does save time and confusion like this.