Did GM for some reason use NGK plugs in some of their newer motors? When I pulled the heads off my 6.0 it had NGK Iridiums in it. I didnt think anybody would change plugs at 30K miles. But I just wondered. I meant to post this a while back but I forgot about it.

 

Yes, they did start putting them in the newer trucks.

 

What year? 05's? 04's?

 

I'm not 100% sure. I just know for a fact that a lot of the GM trucks and cars started coming with NGK plugs. They were basically the same though in that I read that AC Delco just relabled the NGK plug in the first place?

 

they came in my 04 also

 

the double platinums were in my 02

 

Not sure whats in my '03 but the Owner's Manual has part #s for both AC Delco 41-974 and NKG plugs PZTR5A15. So some version of the TR5 plugs.

 

I had NGK's in mine when i changed them.. truck only had 50k on it when i bought it so i dunno if the previous owner changed them.. highly doubt it though..

 

I have NGK's on my 02 from factory.

 

I also had NGK's on my 02 4.8