What's the Difference Between 8mm Spark Plug Wires and 7mm Wires?

8mm spark plug wires are a heavier gage wire than the 7mm type. However, there is more to it than just the difference in the thickness. The thicker wire has a thicker core.

The core is the part of the wire that brings power to the spark plugs. A more robust core provides a lower resistance path for the power, thereby allowing more power to reach the spark plugs. Additionally, the 8mm wires have a thicker outer coating that keeps the core safe from damage.

These wires also have a thicker layer of suppression material. More.

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