Spark plugs Platinum or Iridium

[Onebadsss]

While my knowledge is limited to the LQ9 from owning to Silverado SS trucks and now a 2006 Escalade: ive always been a fan of the NGK Iridium TR55IX (if your engine is N/A) or TR6 (if you're engine is F/I) and have had great results. Pair them with Taylor or MSD plug wires too!

 

[2006Tahoe2WD]

I have the 41-110`s in my yukon and from what i have read the 41-110`s are the same plug as the 41-985 they just changed the number.

Same thing I read and I installed the 41-110's. Working great so far. 2006 5.3L not flex.

 

[ill_noiz]

While my knowledge is limited to the LQ9 from owning to Silverado SS trucks and now a 2006 Escalade: ive always been a fan of the NGK Iridium TR55IX (if your engine is N/A) or TR6 (if you're engine is F/I) and have had great results. Pair them with Taylor or MSD plug wires too!

I already went with the platinum. Maybe I'll try the iridium next time.

 

[Baymax23]

This wasnt the popular answer as most suggested iridium, but you have some persuading proof, I'll go this route, than you for this post.

 

[corvette744]

I just called ac delco my 04 5.3 non flex they say 41-962 plat or the 41-110 iridium both are fine and will work.

 

[swathdiver]

They come gapped already now too. .040". Some of the early GMT800 manuals called for a wider gap but it was later tightened to .040" and all ya have to do now is gently check the gap with a feeler gauge and discard those that are out of spec.