What Is Spark Plug Indexing?

Most of us just take the new spark plug out of the box, gap it and install it in the old plug location and then tighten to factory torque specifications. But, there are some applications in which you need to index the plug.
Spark plug indexing is the orientation or placement of the ground electrode at a specified direction in the combustion chamber. An engine manufacturer or builder might specify a ground electrode orientation for several reasons, including performance, efficiency, clearance or fouling prevention.
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[@roberts1159]

Never knew indexed plugs existed. Thanks for educating us about this topic.

[@ford3961]

I often have to index the plugs on my domed-piston race car engines to ensure that the ground electrode does not contact the piston.