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The Hunter
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Discussion Starter · #1 ·
i just bought a set of ngk tr5gp plugs to replace the stock ones in my 02' 2500hd 6.0l . the new plugs say they are pregaped at 0.40 and my manual says they should be 0.60 . should i go with what ngk says for the gap.
 

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found this


Spark Plug: Technical Service Bulletins Ignition System - New Spark Plug Type/Gapping
Bulletin No.: 03-06-04-060
Date: October 24, 2003
INFORMATION
Subject:
Information on New Spark Plugs and Gapping
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 CMC Sierra
2000-2004 CMC Yukon, Yukon XL
2001-2004 CMC Yukon Denali, Yukon XL Denali
2002-2004 CMC Sierra Denali
2003-2004 CMC 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, LSI, LS6, LQ9, LQ4)
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 1.01 mm (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.
I think this applies to all plugs.
 

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The Hunter
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Discussion Starter · #3 ·
I think this applies to all plugs.
that post says its for the iridirum tip plugs , i have the platium tip plugs
 

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It should apply also to the platium plugs. Wheather thay are iridium or platium because you can damage the tip if you try to regap them. Just check the gap and leave em at .040.
 

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Just put in NGK iridiums in my bro in laws 06 Suburban and he says it has been running great.


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Did these ngk plugs work well?
In LS engines AC delco plugs would be the ONLY plug I'd put in.

also nice job using the search function, even if you did dig up a post from '09
 

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I have read in two different forums where two separate people that claim they are in the auto parts business say that SOME of delco's plugs are made by NGK. I believe it has been confirmed that delco is known for doing this with other parts specifically Raysbestos making their brake pads. Take that for what it is worth.........


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I've never used anything in an LS motor other than NGK. They perform flawless, cheap, and easy to find when needing a step colder for added boost

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