Well I picked up my camaro from the local chevrolet dealership to get some stuff fixed and have my engine looked at because it was running a little rough. I asked them about the proper gap for spark plugs...they said 0.060. I went over to the parts department to check out the plugs and I noticed that they are set to 0.040. i was wtf is going on here. So the service advisor went and searched through the GM network and found a letter showing a **** load of cars and stating that the spark plug gap for all these cars is 0.040. It was dated 2003...don't remember the exact date.

I wish I woulda known all this when I put the fockin things in

 

.060 is the the proper gap for any LS1 i've seen....

that's what mine are at and it runs fine

 

What about the NGK TR 55's? They come gapped at .050, is this correct or should I set mine to .060?

-Travis

 

The gap usually is located on the radiator cover. If it says .060 use .060 even if the come pregapped at .050.

 

Yea all that sounds great. but thats what they said at the chevrolet dealership....i seen it with my own eyes. I'll try to get a print out of it and post it on the post. this is weird huh

 

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

Document ID# 1396703

 

The NGK TR-55's that I picked up for a friend of mine came gapped .060".