Spark Plug Gap

This article has been updated with TSB #03-06-04-060B

INFORMATION ON NEW SPARK PLUGS AND GAPPING

SPARK PLUG GAP 1.01 mm (0.040 in.)


^ A new spark plug has been released for use in certain vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed.

^ The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (0.040 inches) when the spark plug is made.

Notice: The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.