Hey man this is really funny because i wondered the same thing. The engine is an overhead cam design and the spark plugs dont screw in the sides like a traditional v-8 head. Each plug has its own ignition coil and they are located on top of the engine right next to the injectors. The timing etc is computer monitored and they did away with all the messy wires etc. I started to change my plugs for better performance but the svt guys said it wasnt worth it , plus it would take forever.A real