Hello folks, thanks to recent messing about with spark plugs, I have created a guide for changing the spark plugs on the VQ35HR engine found in the Model Year 2007+ 350Z.   This Guide is for the 309BHP HR engine, not the VQ35DE and rev-up engines found in 2002-early 2007 Zeds. The later engine is identifiable by the twin air intakes and the humped bonnet.   Please note the spark plugs in the HR engine are smaller than those in the DE and Rev-up, M12 threads versus M14. The HR