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2007 TBSS AWD
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31,503 Posts
Discussion Starter #1
What spark plugs are you guys using for N/A TBSSs? I had always used NGK TR-55s for my previous V8s. The LS2 has a smaller gap...so I guess the NGK TR-5 would be the correct plug for this application. TR-6 is better in FI/N2O motors due to it being a heat range colder. I have had the best luck with NGK (regular, not platnum/iridium etc..) in the past and plan to stick with those unless There is a reason to switch. I have never found the stock spark plugs to be all that great in any of my previous GM V8s
 

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2006 TBSS
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820 Posts
I am using NGK TR-55IX.. I have used TR6s (woops), TR55s, and the stockers. Used all of them with stock plug wires and only the IX's with the new MSD wires.. If I were you I would get MSD wires along with the TR-55s. Especially if you have headers... 800ohms on stockers, 50 ohms on msds.. thats huge.
 

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Premium Member
2007 TBSS AWD
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31,503 Posts
Discussion Starter #3
What gap are you running them at? I know that GM reduced the gap to .040 because the LS2s come with factory iridium plugs. I have heard that you can run a .055 gap like the LS1s with a copper plug like the TR55 though. What did you gap the TR55 at and what do you gap the TR55IX at currently?
 

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2006 TBSS
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820 Posts
On the TR55IXs I put the gap at .044; and believe me.. that little shit electrode is hard as hell to gap.. I think I might've been too careful with it, but still.. better safe than sorry... On the TR55s I did .050; although I think about 75% of the LSx crowd do .055. They are a nice chunky electrode so its easy to gap em.. I'd buy two spark plug gappers too.. one to use on left bank.. one to use on right.. Just because of wear and tear in the micrometers (heh, I'm anal). Another thing, if you tend to bang em around trying to get the spark plug in.... it might get out of gap.. And don't trust the pre-gap.

Note on my previous post: re checked wires.. they are ~25 ohms. I wasn't making proper contact before.
 
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