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Old Oct 10, 2006 | 07:20 PM
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Default Best Spark Plug?

Question for the day.....

What's the best bang for the buck when it comes to spark plugs for the
C5?



And oh yeah.. safe for the engine... What do you all think?
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Old Oct 10, 2006 | 07:52 PM
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NGK TR55
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Old Oct 10, 2006 | 08:52 PM
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Default Hmmm...

How ya doing?
Did you notice a difference with the NG's..and what mileage did you replace 'em?
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Old Oct 10, 2006 | 09:23 PM
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Originally Posted by Ta-taaa
Question for the day.....

What's the best bang for the buck when it comes to spark plugs for the
C5?



And oh yeah.. safe for the engine... What do you all think?
When it comes time...I'm gonna use the OEM plugs....they are good enough for my princess
btw...hello from 23606
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Old Oct 10, 2006 | 09:38 PM
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AC Delco Iridum Plugs like the factory puts in now!
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Old Oct 10, 2006 | 10:01 PM
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Originally Posted by ROJ#79
AC Delco Iridum Plugs like the factory puts in now!
no worries about changing at 15 or 20K. Iridum plugs are top notch and good for 100K
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Old Oct 10, 2006 | 11:10 PM
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Originally Posted by JropTop
NGK TR55
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Old Oct 10, 2006 | 11:23 PM
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I went with the TR55ix plugs. Regapped to .052"
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Old Oct 11, 2006 | 07:04 AM
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It was hard to notice a difference with the rest of the mods,but i did regap mine to .050 and replaced them at 16k,no problems
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Old Oct 11, 2006 | 07:06 AM
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I'll be putting the NGK TR55s in mine when they need to be replaced. Had these plugs recommended by two different shops now.
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Old Oct 11, 2006 | 07:36 AM
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Originally Posted by JDs00PewterCoupe
I'll be putting the NGK TR55s in mine when they need to be replaced. Had these plugs recommended by two different shops now.
almost the 'standard' n/a plug
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Old Oct 11, 2006 | 01:37 PM
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Originally Posted by JDs00PewterCoupe
I'll be putting the NGK TR55s in mine when they need to be replaced. Had these plugs recommended by two different shops now.

and a whole slew of guys that race Vettes and have 10 second cars.
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Old Oct 11, 2006 | 01:39 PM
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NGK TR6 all the way,.... The 55's and 5's dont like nitrous as much
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Old Oct 11, 2006 | 02:45 PM
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The ngk tr55's come platinum or Iridium dont they?
Which would be preferable?
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Old Oct 11, 2006 | 03:21 PM
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I use TR55ix plugs. They are a bit spendy but what isn't for this car ($8/plug at NAPA)?
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Old Oct 11, 2006 | 03:26 PM
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NGK TR55 are the best for the Corvette
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Old Oct 11, 2006 | 03:31 PM
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So the NGK TR55 plug will be a better plug lasting about 1/3 of the miles of the stock plugs, but how much better are they really??? Is there a measurable difference in performance or is this just another "every last tenth of a second" thing?

Last edited by 99magredcoupe; Oct 11, 2006 at 03:34 PM.
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Old Oct 11, 2006 | 07:41 PM
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Originally Posted by clayton1
The ngk tr55's come platinum or Iridium dont they?
Which would be preferable?
The Iridium's are the better choice. The problem with platinum is that it runs a little bit hotter than copper or iridium, so you've got a greater chance of detonation with platinum. You might end up getting one or two degrees more knock retard with platinum than with iridium or copper.

I've been using TR55 copper plugs in mine, at .050 gap, but am curious about the iridiums and might try them out on my next plug change. So far I've been changing the TR55 coppers out about every 6 months, which works out to about 8-10k typically. (that's probably a bit too soon, but I hate leaving plugs in too long for fear they'll get stuck)
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Old Oct 11, 2006 | 07:47 PM
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Have any of you used the Bosch +4 plugs? I've had very good luck with them in other cars just curious how they work for the vette.
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Old Oct 11, 2006 | 07:53 PM
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Originally Posted by ROJ#79
AC Delco Iridum Plugs like the factory puts in now!


I have ran a few different plugs and fnd myself returning to the AC Delco setup. Good for the 100K and the tips don't back out (NGKs have screw on tips and I hate that).

NGK 55s are fine, but not my #1 choice.
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