I've used Champion Double Platinum plugs in my L27 before. Ran those for about 80k miles with absolutely no problems and perfect performance. Those weren't Bosch plugs though.

With the Northstars, I wouldn't have it any other way. The rear plugs on the GXP are a bit involved to get to from what I've heard.

A 3800 will not like them. I've tried it, many people have tried it, and its a bad idea. Save yourself the work and trip to the store and just get a good set of ACDelco, Champion, or Autolite plugs.

there * your red flag VENDO

and i only bought them because it was one of those days where iwas super boired just sittin around watchin tv and i saw sttacey david on gearz test em in a lil machine so i figured eh why not and wen and got some lol

Don't know where you came up with that. GM specifies double platinum clads for almost all N* applications.
http://parts-catalog.acdelco.com/cat...&parttype=3210



They are set a .50 and Not to be regapped.

And as far as Denso being a AC vendor, I highly doubt GM would use Jap plugs. And certainly not admit to it. I hear the gamut of guesses as to who make what AC Delco Plug. And not once have I seen a credible source. AC isn't talking.

I saw that same show with david stacey=stacey david lol

well i ran the stock plugs in my 98 T/A and it never burped,not sure what they were..

what would cause a slight vibration at idle in gear,put it in neutral and it goes away?

start a new thread about it