Spark plug preference?! - Pontiac GTO Forum
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post #1 of 10 (permalink) Old 04-21-2010, 07:43 PM Thread Starter
 
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Spark plug preference?!

I am currently using AC Delco's no gap on my 05' 6.0 GTO. I am running a K&N typhoon intake, and are not gaping the plugs at all. The black smoke out of my exhaust is having me question

Anyone have a preference on plugs they prefer?

Andrew

05' GTO 6.0 v8
Typhoon K&N air intake system.
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post #2 of 10 (permalink) Old 04-21-2010, 08:24 PM
 
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If you don't gap your plugs before you install them you might as well not bother changing out the old ones. 0.040" is the gap you need.

I just put in some NGK TR5 IX iridiums two days ago. 39,000 miles on the clock and the factory plugs were way out of gap spec (as much as 0.060") and the ground electrodes had quite a bit of erosion.
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post #3 of 10 (permalink) Old 04-22-2010, 08:52 AM
 
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I've never heard of no gap plugs before. Also don't see them on their webiste: http://www.acdelco.com/parts/spark-plugs/ When you search their site it only lists part number 41-110 for the LS2 goat.

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

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post #4 of 10 (permalink) Old 04-22-2010, 08:55 AM
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If the plugs are the platinum tipped or the iridium plugs you can damage the tips by trying to gap them. They should be gaped in the box as you order them vehicle specific.
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post #5 of 10 (permalink) Old 04-23-2010, 09:32 AM
 
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Originally Posted by Rukee View Post
If the plugs are the platinum tipped or the iridium plugs you can damage the tips by trying to gap them. They should be gaped in the box as you order them vehicle specific.
When I did mine I gapped the ground electrode with a needle nose, staying away from the post side. I figured the plating on them is probably pretty thin, so they probably wouldn't take well to tool contact.

Even pre-gapped plugs can be out of spec just from bouncing around during shipping, unless they put one of those cardboard sheaths over the electrodes, which I haven't seen in a while.
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post #6 of 10 (permalink) Old 04-23-2010, 10:01 AM
 
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Originally Posted by Poncho Dan View Post
When I did mine I gapped the ground electrode with a needle nose, staying away from the post side. I figured the plating on them is probably pretty thin, so they probably wouldn't take well to tool contact.

Even pre-gapped plugs can be out of spec just from bouncing around during shipping, unless they put one of those cardboard sheaths over the electrodes, which I haven't seen in a while.
NGK has the cardboard condom over the tips :-)

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

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post #7 of 10 (permalink) Old 04-23-2010, 10:30 AM
 
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True, but mine were gapped well under .040...

And damn well they should at $7 a pop.
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post #8 of 10 (permalink) Old 04-24-2010, 09:49 AM
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Garage
Get a gapping tool, it's the best way to gap. NKG-55s are a good plug too.

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post #9 of 10 (permalink) Old 06-01-2010, 08:50 AM
 
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I recently bought a set of NGK-TR55's for my 06 LS2, What gap should I use on these?
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post #10 of 10 (permalink) Old 06-01-2010, 03:38 PM
 
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I recently bought a set of NGK-TR55's for my 06 LS2, What gap should I use on these?
.040 Trust me I tried a variety of gaps in both directions and nothing worked as well as the factory setting.

I also run NGK TR55. I never gap with anything other than a feeler gauge and I set the gap by turning the plug upside down on a block of wood then inserting the blades and lightly tap the electrode with a brass hammer. I feel that this method should be safe for gapping the Iridiums without damaging the coating.
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