These are some of the easiest engines to change the plugs on since they are right there on top of the head...just take the cover off, pull the COP out of the hole and off the spark plug, remove the old plug, use some anti-sieze on the threads of the new one, and don't cross thread or over torque them when putting them back in...The torque spec on them is 7-14 ft-lbs....The aluminum heads are very touchy to cross threading and you can' really screw them up if that happens...