How does a spark plug wire length chart help you?

I need to get my spark plug wires replaced, but there are so many options! How do I decipher a spark plug wire length chart? Why does the length matter?

Bonnie Stinson · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
A spark plug wire length chart can help you know which category of wire to buy based on how long the wire is.
You really only want to use wiring just long enough to get from the spark plug to the distributor. This will prevent wires from getting in the way of other moving parts under the hood.
If you’re having trouble choosing the right spark plugs for your vehicle, the most important thing to keep in mind is the type of inner core in the wire. There are three main types, as follows:
Core type
Carbon core
Cheapest option, great RFI suppression
Higher resistance, breaks down faster than other styles
Solid core
Very low resistance
Very low RFI/EMI suppression
Spiral core
Low resistance and great RFI/EMI suppression
Most expensive option
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