Car is completely stock and has been using 93 grade gasoline. The only I did to it was add the K&N drop in. What is the gap on the plugs for our cars?

 

Can't remember off the top of my head, but it should be in the back of your manual if you still have it laying around. In that section with all the specs, weights, measures, etc.

 

My plugs look just like that and it runs fine. Those look normal to me.

I THINK stock gap is .032. I've personally experimented with different gaps and ended up at .032. It seems to work the best. If you go smaller it's fine except it seems to bog down easier.

 

.035 is stock for a TC .

Spark Plug Replacement
Removal Procedure




Caution: This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage.

•Remove the ignition coil(s). Refer to Ignition Coil Replacement.
Note: Make sure that any water and/or debris is blown out of the spark plug holes prior to removing the spark plugs.

•Remove the spark plugs using a 5/8 inch spark plug socket.
Installation Procedure
Caution: Refer to Fastener Caution in the Preface section.





Caution: Do not coat spark plug threads with anti-seize compound. If anti-seize compound is used and spark plugs are over-torqued, damage to the cylinder head threads may result.

•Install the spark plugs and tighten to 20 Nˇm (15 lb ft).
Specification
The spark plug gap is 0.90 mm (0.035 in).

•Apply dielectric compound to the spark plug boots and make sure no corrosion is present.
•Install the ignition coil(s). Refer to Ignition Coil Replacement.
Š 2009 General Motors Corporation. All rights reserved.

 

Autolite XP plugs: XP5263 $6.50 each

Is that the plug im looking for. same as stock?

 

Nope. Get only the OEM AC Delco's. Most other plugs will be of improper heat range and will cause misfires.

 

AC Delco's with .29 inch gap? that sounds like the best bet? Im dyno tuned to 21psi and 334 tq with 20k miles on stock plugs now if that makes any difference in plugs and gap

 

Gap on my replacement Delcos was .33

Car is back to normal after the plugs swap. GMPartsdirect sold me 8 plugs for 50 bucks.

 

Looks ok to me...iridium plugs have thin electrodes...I've gone a step colder with NGK now that I'm running higher boost...

 

Keep us posted please...

How about the number?

 

of the plug? I'll have to look it up...

 

So what would be the best plugs for me with my mods and gap??

 

It has already been mentioned, STOCK plugs. They will treat you the best and won't misfire as much as you would get with lower gapping, etc.

Just be prepared to replace them every 5-7k, like an oil change.

 

What boost are you running? I'm running 23psi and my insider at NGK recommended NGK Iridium IX LTR7IX-11 (6510) so that's what I'm using...running great so far!

 

ok well im pretty sure the stock plugs will **** them self soon sence im spraying meth so thats why this thread was made to see what plugs work with what

 

I pulled the stock plugs this weekend for inspection. I run a bit of boost also and while they look ok, I tend to think one range colder would be better in the long run with a lot of timing.

Thanks for the info. Keep us posted.

 

I use one step colder plugs on all my boosted toys, including my pumped Mini Cooper S...

 

looks normal to me. they are platinum's the electrode is very thin to begin with.

 

Yeah i boost 22psi and if u like em then i'll try em out

 

Gap .036...becareful gapping...don't touch the iridiium tip

 

Ok cool i asked my friend that works at kragen/O'riley to order them for me
and i'll keep in mind to touch the iridium tip
thanks man

 

Installed the NGK Iridium IX LTR7IX-11 (6510) plugs today, definitely a colder plug. The depth from the thread shell to the body of the plug inside next to the porcelain is about 1/4" shorter checked with a crude depth gauge (strand of fine wire). It will definitely dissipate the heat faster. Might be too cold a plug.

I'll run them a few weeks and inspect them. Running fine gapped at .032".

 

So, I typed in the GM pt# on GMpartsdirect and it says that its $5.20, and that the plugs come in a pack of 8? Surely this is incorrect?

 

No, they ship them in sets of 8, I looked there last week myself. I got the NGK Iridiums direct for about $8 a piece.

 

i ordered the 41-108 from GMpartsdirect. yes, it is a pack of 8. and the shipping was quick even with them not having them instock. got them in about a week and a half.