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LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

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Old 03-03-2006, 03:00 AM   #1
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LT1 - What brand / type spark plugs?

LT1 guys.....

What brand and type (platinum, regular, iridium, etc..) of sparkplugs do you use / recommend in your LT1?

I was running Delco Platinums, but know they are not the best, so I am wondering what everybody uses.

Car is N/A only with no N2O or boost. Ill post my sig for the engine and car details.

Thanks in advance.
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Old 03-03-2006, 03:57 AM   #2
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Using NGK TR-55 regular plugs at the moment...

Last edited by Firebat; 03-03-2006 at 04:05 AM.
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Old 03-03-2006, 10:33 AM   #3
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I was running NGK TR6's in prep for nitrous, but I'm holding off on the juice for a while so I switched back to either Delco's or Autolite 103(?)'s I think.


Since you're not going to be running spray or boost, I would recommend a platinum plug. Stay away from the multiple electrode ones, just run a standard Delco platinum and you'll be good to go.
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Old 03-04-2006, 09:52 AM   #4
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I would run delco platinum or the NGK's, plainum give you more miles before you have to change them
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Old 03-04-2006, 11:08 AM   #5
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NGK TR-55's here, platinums are junk and not worth the price for them. The Delco plats are around 7 bucks a pop.
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Old 03-04-2006, 01:35 PM   #6
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I ran Delco platinums in my 95 Impala, only used 2 sets with over 150,000 miles ....as the platinum wears slower than copper....you'll get better conductivity and spark overall from the copper plugs....TR-55's are the way to go.....just depends on how often you wanna change 'em........
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Old 03-04-2006, 02:25 PM   #7
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It looks like the TR-55's are the way to go. How often do you guys have to change em?
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Old 03-04-2006, 03:37 PM   #8
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Quote:
Originally posted by Klortho
NGK TR-55's here, platinums are junk and not worth the price for them. The Delco plats are around 7 bucks a pop.
my dad has run only platinum plugs in his '99 Silverado. Truck has 480k miles on it and he's barely on his 3rd set of plugs. Not worth the price?
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Old 03-04-2006, 06:02 PM   #9
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I just picked up a set of TR-55's (non-platinum style). Thanks for all of your help.
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Old 03-05-2006, 07:18 PM   #10
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I never ran anything other than TR55 in my 94, and it is what I plan onrunning again once I get the LT1 in the 86. It is not that hard to take an hour out of your day every 10k miles. Plus, they are only 1.75 a piece.
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Old 03-05-2006, 07:29 PM   #11
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i am using the ac delco ones and love them, cant go wrong with the gm product
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Old 03-10-2006, 01:06 PM   #12
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AFR recommends these as starting range for their heads...

AC FR3LS

Haven't fired the motor up since I am still putting it together so I don't have any real experience with these plugs, but it is the recommendation on the AFR site.
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Old 03-10-2006, 01:06 PM
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