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Generation III Internal Engine 1997-2006 LS1 | LS6
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Old Jan 30, 2012 | 12:15 PM
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01FASTWS6's Avatar
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Default Plugs?
Alright, after searcing around, I still cant find what i need.

I bought NGK TR55IX plugs for my 01 bird LS1. I noticed on their site, and their book that this plug does not come up for this motor/year yet i see other guys running them.

What I'm trying to make sure is if it is ok to run these plugs, and what gap? It looks like they have a shorter reach then the "reccomended" plugs.

Motor will have a TrickFlow Stage 3 Cam, full length headers/full exhaust. No spary (yet).

Thanks in advance!
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Old Jan 30, 2012 | 12:24 PM
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not sure what the IX is but most people run a TR55. it doesnt come up because the oem plug is iridium
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Old Jan 30, 2012 | 12:32 PM
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the IX are iruidium. They are supposed to be pregapped and recommend not adjusting the gap. The was a service bulletin for our cars changing the recommended gap to .40 instead of .60 Regaping iridium plugs could damage the tip.
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Old Jan 30, 2012 | 12:50 PM
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I always use the factory ac delco iridiums just because the gap is smaller than 60 thousandths to account for increase in gap over time....but to answer your ? You are good to go
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Old Jan 30, 2012 | 01:31 PM
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I run and swear by standard old Autolite 103's
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Old Jan 30, 2012 | 02:04 PM
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I run the NGK TR55's and I gapped them at 55. You should be completely fine with these. But when you add that spray you'll need some colder plugs (TR6's).
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Old Jan 30, 2012 | 04:16 PM
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Originally Posted by MT0911
I run the NGK TR55's and I gapped them at 55. You should be completely fine with these. But when you add that spray you'll need some colder plugs (TR6's).
I'd use a BR6EF if a 150+ shot
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Old Jan 30, 2012 | 06:27 PM
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Originally Posted by Z28/2002
I'd use a BR6EF if a 150+ shot
Sounds good - if running a 150 shot the BR6EF would be great or even a BR7EF since the OP is saying he'll be cammed. You're right though, the non-projected tip on those would be safer to run with nitrous when that much more power is had above stock. Good catch.
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Old Jan 30, 2012 | 06:36 PM
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Ac delco bought ngk so id say your goid to go with ngk if you trust delco.


I think i should recheck my gaps, but im pretty sure im
Around .53
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Old Jan 30, 2012 | 09:05 PM
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Thanks for the replies guys.

Has anyone re-gapped the iridium plugs? If so, what is the "ideal" gap for my current setup?
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Old Jan 30, 2012 | 09:34 PM
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Originally Posted by 01FASTWS6
Thanks for the replies guys.

Has anyone re-gapped the iridium plugs? If so, what is the "ideal" gap for my current setup?
You dont regap the irridiums, you will more then likely hurt your plugs more then doing them good.
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