set of 8 lightly used NGK TR6 IX spark plugs maybe 500 kms on em
 

these were used on my supercharged ls3 for 1 summer maybe 500 kms on em decided i wanted the cheaper copper ones with my new set up these are the iridium plugs cost about 15-18 dollers each new anyways 40 bucks plus shipping takes them they are all in good shape just removed today and in boxes james 250-308-1720 text or call

I wonder if there worth running in my NA LS3? Could be interested.

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ya i used em in mine but went to cheap copper ones trying to eliminate 6000-6700 rpm misfire think i was blowing out the spark someone recommended the cheaper plugs so ill try em. just finished trans swap th400 3000 stall and trans brake haven't driven more than 10 feet yet tho haha exhaust gotta get changed up