Help finding a TSB


I need to take the Vette in to get the oil pressure sending unit replaced, and figure it might be a good time to replace the spark plugs, especially if that is also under warranty.
Thanks. :seeya :steering:
You can search for relevant TSB's at that site.
Information on New Spark Plugs and Gapping
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)
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.
Hope this helps:
"This is to advise ALL Corvette c5 owners of a bulletin, 03-06-04-060, which updates spark plug application and gap.
This states that as of 24 October 2003, part number 12571164 is the replacement spark plug for ALL c5 Corvette, LS1 and LS6.
However, this also shows us that the new gap, of .040, is set at the factory. Any attempt to regap this plug could damage the plug. We are instructed to NOT USE THE PLUG, if the gap of .040 is not there. DO NOT GAP TO .060.
NOW, the largest point to be made here, is that this plug uses an Iridium tip for the electrodes.
This is the first for Corvette.
Others claim to be Iridium tipped, but are NOT in the GM line.
The ACDelco number is 41-985.
So, with that, please be aware of this and utilize this plug from here on in.
Aside from this, I have contacted GM powertrain on the updating to the PCM control calibration for these new plugs and have been told that the latest calibrations are already set up for the revised plugs. Apparently, they knew these plugs were coming, and compensated accordingly."











