It took me 2- 2 1/2 the first time,the #6 is the tough one. One thing I learned thru experience,you only need the remove the front 5/16" bolt from the injector hold down,the rear one can stay tight,just slip it out. Do not use a pry bar on the injectors,pull the finjector tubes out,then remove the injectors,you dont want to nick the tubes. Good luck.