spark plug gap 0.060 or 0.040?
05-25-2013, 05:46 PM
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spark plug gap 0.060 or 0.040? From ALLDATA for "GM" technical service bulliten posted in 2008. vehicle application 1998 -2002 "LS1' -----This article has been updated with TSB #03-06-04-060BINFORMATION 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.
05-25-2013, 06:38 PM
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From ALLDATA for "GM" technical service bulliten posted in 2008. vehicle application 1998 -2002 "LS1' -----This article has been updated with TSB #03-06-04-060BINFORMATION 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.
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05-25-2013, 07:36 PM
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If you are using the GM iridium tip plug, then use the factory gapping of .040" that is called for in the bulletin.
I pulled out my stock platinums (gapped at .060") and intalled the new GM iridium plugs with the factory preset .040" gap and everything has been fine for a year now.
In my other LS1 I'm still using old conventional tip plugs and keep them gapped at .055".
I pulled out my stock platinums (gapped at .060") and intalled the new GM iridium plugs with the factory preset .040" gap and everything has been fine for a year now.
In my other LS1 I'm still using old conventional tip plugs and keep them gapped at .055".
05-25-2013, 10:07 PM
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If you are using the GM iridium tip plug, then use the factory gapping of .040" that is called for in the bulletin.
I pulled out my stock platinums (gapped at .060") and intalled the new GM iridium plugs with the factory preset .040" gap and everything has been fine for a year now.
In my other LS1 I'm still using old conventional tip plugs and keep them gapped at .055".
I pulled out my stock platinums (gapped at .060") and intalled the new GM iridium plugs with the factory preset .040" gap and everything has been fine for a year now.
In my other LS1 I'm still using old conventional tip plugs and keep them gapped at .055".
