Brother of The Benz, JRBrown
As you can see when looking in the cap at the machining marks of the conductors, they are machined differently.
This resulted from the loose tolerance in molding the cap and conductors.
The base diameter of rotation of the rotor plus clearance is the machined diameter you see in the cap.
Assume you have a clearance of 0.060 or 1/16 inch between the tip of the rotor to the conductor in the cap, this is the "spark gap" between the two.
If the resistance of the spark plugs and thier wires is at minimum, then the arcing in the cap is minimumal.
The conductive grease helps contain the arcing.
But a dry air gap is the designed method to conduct the coils energy.
Concerned preventative maintainance extends the life of any component; especially spark plugs and wires.
Happy Trails Beep Beep from The Spiderman in Houston!!!