What Is Spark Plug Indexing?

Spark plug indexing won't make much of a difference in your average stock car, but it can have a noticeable impact in ...
Hot Rod

Does Indexing Spark Plugs Work?

Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons. Moroso offers different thickness spark plug washer kits to do this. Some theorists claim positioning ...