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What Spark Plugs do you use?

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Old 01-10-2014, 03:44 PM
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Ngk-tr6ix gap 035
Old 01-10-2014, 04:18 PM
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Cool thanks mel
Old 01-12-2014, 03:22 PM
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Originally Posted by Mels SS
Ngk-tr6ix gap 035
Will those plugs at that gap be good for a nitrous application too?
Old 01-13-2014, 08:36 AM
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Yes the NGK tr6ix gapped @.035 will do fine for the occasional spray,
with that said though if you plan on spraying often then I would recommend the even cooler plug to start tr7ix gapped @.035 as to cold a plug will only foul/not self clean (a quick inspection of a plug after dd use and after spray use will reveal if they are fouling) If you are using a plug that is too hot... Detonation and/or engine damage can and will occur.
Old 01-23-2014, 05:51 PM
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I am in process of putting headers on and want to replace plugs while im there. TR55s???? i have seen a lot of people use them just wondering. car is stock now but soon will be getting cam and converter..
Old 01-23-2014, 06:24 PM
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Interesting question! I have one for you, Why would you downgrade from an iridium plug?
But then again are you asking for them for your WS6 or an LS4?
Old 01-23-2014, 06:46 PM
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For nitrous apps I read using projected tip type plugs (tr6...etc)were bad?
Old 01-23-2014, 06:52 PM
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WS6. Not sure i just seen people use them and didn't know why?
Old 01-23-2014, 07:03 PM
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Originally Posted by 91parkave
For nitrous apps I read using projected tip type plugs (tr6...etc)were bad?
Here is a Quote direct from NGK:

Can I Use Platinum or Iridium Plugs with Nitrous Injection?


Platinum Plugs: There have been instances where the platinum tip has lost its bond to either the center or ground electrode when they were used in a motor with nitrous.


Iridium Plugs: To date, there haven't been any reports of problems using Iridium plugs with a nitrous system, or with a blown alcohol motor.

There is also a warning in my hard manuals from GM here:
The Emission system in this vehicle requires a minimum Iridium Base Spark Plug.

just some food for thought...
Old 01-23-2014, 08:40 PM
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I have still yet to use the Bosch iridium plugs I won in the contest haha
Old 02-24-2014, 11:38 PM
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So what did you get?
Old 02-24-2014, 11:51 PM
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NGK Iridium IX Spark Plugs are amazing for LS4 cars (NGK-3689)

The 3689's are nice cause they run a tad bit colder also

Platinum plugs are doo doo butter in most built cars it seems, most people seem to use either copper (good for no2) or iridium in race applications
Old 02-25-2014, 12:36 PM
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Originally Posted by 06MonteSS
NGK TR6IX Iridiums... which are one heat range cooler than stock plugs.. and gapped to .035 instead of stock 040....
Would this colder plug be ok to use if i do not have a tune?
Old 02-25-2014, 12:43 PM
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Originally Posted by bignosecaveman
Would this colder plug be ok to use if i do not have a tune?
Absolutely the ls4,in stock form is very aggressive. Colder plugs help fight the kr some.
Old 03-11-2014, 02:47 PM
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Default tr5ix vs tr55 vs tr6ix? (All NGK iridium)

Whats the drifference between the NGK tr5ix, tr55 and tr6ix? I'm looking to change the spark plugs on my 2008 impala ss (97k miles) and I'm researching. But here a lot of people mention tr6ix, while the NGK website recommends tr5ix. Just wondering what the difference isbecause I don't want to put in the wrong ones.



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