Try this.. Lol

 

mine was on the air cleaner cover. and it was .060 so thats what i gapped them at.


as for that last pic, i am afraid to ask where the rest of the spark plug went? that could be very damaging!!!

 

i guess that plug is after spraying and got detonation and blew the tip off?

id leave them pre gaped

 

Happened several times running 150 shot. This one came from #8 cylinder. Never hurt the motor, it would just start idleing rough and i knew i had blew another tip off..

 

.060 is the gap for the platinum plugs, GM calls for .040 for the iridium. I'm sure it will run fine, but the gap should be at .040 if using Delco iridium plugs

 

pulled them out and re gapped them at .040 today.

 

My 2004 4.8 has AC irridiums at .040 . I checked the new ones for .040 ;I hope it didn't rub any irridium off. Can that really happen?

 

I believe certain years call for different gaps.... My hayes manual reflects that, also the Spark Dwell time in the tune is different between the years which corresponds to the different gaps.. So just saying your generic measurements above is to 100% accurate....

 

I believe the 41-985s were superseded by 41-110. The gap remains the same. This bulletin has been updated to cover models through 2009.

Document ID# 1396703


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Subject: Information on New Spark Plugs and Gapping #03-06-04-060 - (10/24/2003)



Models: 2004 Buick Ranier

2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

2004 Cadillac CTS-V

1997-2004 Chevrolet Corvette

1998-2002 Chevrolet Camaro

1999-2004 Chevrolet Silverado

2000-2004 Chevrolet Suburban, Tahoe

2002-2004 Chevrolet Avalanche

2003-2004 Chevrolet Express, TrailBlazer

1999-2004 GMC Sierra

2000-2004 GMC Yukon, Yukon XL

2001-2004 GMC Yukon Denali, Yukon XL Denali

2002-2004 GMC Sierra Denali

2003-2004 GMC Envoy XL

1998-2002 Pontiac Firebird

2004 Pontiac GTO

2003-2004 Hummer H2

with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U -- RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)




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A new spark plug has been released for use in the above 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. 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.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 1396703

 

Yessir, different years have different gaps as different years have different plugs I remember the spark dwell tables that you posted and just thought of something...I know that it probably makes very little difference, but if you hypothetically have a 99 with platinum plugs gapped at .060, and you switched to iridium plugs, you should leave the gap at .040, and change the spark dwell tables in the tune to be totally accurate...something to ponder