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|Electrode Tip Material:||Xtreme Performance|
|Thread Diameter:||14 mm|
|Tip Configuration:||Special Power|
|Wrench Diameter:||5/8 in|
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Q:are these pre gapped for the vehicle
A:No, this Autolite Spark Plug - part# XP5405 is not pre gapped. Gap new plugs as recommended in your owner's manual or a Spark Plug Catalog. Use a feeler gauge to measure the gap between the center and ground electrode. The gauge should pass through snugly but easily. If it's too loose or too tight, reset the gap.