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Generation III Internal Engine 1997-2006 LS1 | LS6
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TR55 or TR6

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Old 06-26-2006, 09:31 PM
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Default TR55 or TR6
Should I go with a TR55 or TR6 plug?

Mods are LS2 with H/C and full bolt ons. CR will be around 11.0


I was think TR-6... watcha think?
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Old 06-26-2006, 10:03 PM
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TR6...thats what I run.

The tr55 will work...but they will be getting a little bit on the hot side.

100 horse over stock and or 11:1 compression equals a step colder plug.
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Old 06-26-2006, 10:12 PM
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Originally Posted by UltraZLS1
TR6...thats what I run.

The tr55 will work...but they will be getting a little bit on the hot side.

100 horse over stock and or 11:1 compression equals a step colder plug.
cool, that's what I was thinking.

I will be 200 horse over stock
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Old 06-26-2006, 11:05 PM
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yep what he said, run the tr6 at a tighter gap between 0.045-0.050
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Old 06-27-2006, 12:25 AM
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Originally Posted by viewsonic
Should I go with a TR55 or TR6 plug?

Mods are LS2 with H/C and full bolt ons. CR will be around 11.0


I was think TR-6... watcha think?
Is the TR6 a tapered seat plug or gasketed?? Which type of plug do the heads that you're running now take??
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Old 06-27-2006, 05:06 AM
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I am going with TR-6's as soon as I have the time to install them in place of my 5's.
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Old 06-27-2006, 05:07 AM
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Originally Posted by Gearhead1
Is the TR6 a tapered seat plug or gasketed?? Which type of plug do the heads that you're running now take??
Probably not gasketed.
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Old 06-27-2006, 09:34 AM
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Originally Posted by WS6FirebirdTA00
yep what he said, run the tr6 at a tighter gap between 0.045-0.050
Don't TR6 come pre-gapped at .035"? So they should be opened up to .045-.050?
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Old 06-27-2006, 11:38 AM
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same question
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Old 06-27-2006, 11:40 AM
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If the ls2 head is the same as the ls1 then it's a tapered seat with .708" reach.
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Old 06-27-2006, 12:11 PM
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I run the TR6, ran the TR55's and they were too hot, better safe than sorry, and bring it down a notch.
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Old 06-27-2006, 12:15 PM
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I run the 6's but have been thinking about going with the 7's. does anyone hee run the 7's?
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Old 06-27-2006, 12:22 PM
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Switching to the TR6 myself.
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Old 06-27-2006, 04:28 PM
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Going 6's here too, 5's a little hot.
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Old 06-27-2006, 08:41 PM
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How can you tell they are too hot??
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Old 06-27-2006, 09:04 PM
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ETP GIII cylinder heads require 14mm x ¾” reach spark plugs.
so will TR-6's work ok for my ETP's?
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Old 06-27-2006, 09:05 PM
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BTW TR6 has a .39 Gap
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Old 06-27-2006, 09:38 PM
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Originally Posted by Mr. Luos
How can you tell they are too hot??

I have the same question too! How to tell?
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Old 06-27-2006, 10:12 PM
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Originally Posted by 00SS4780
I have the same question too! How to tell?
detonation problems? just a guess....
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Old 06-28-2006, 08:17 AM
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I would like to know as well.
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