Was going to replace the spark plugs today in my 2001 Silverado 1500 with a 4.8L. The plugs that came out of it are NGK PZTR5A and also say ACDelco 12567759. I've been to 4 stores (NAPA, Advanced, OReilly's, Sturdevants) and they all look at it like it's a ghost and have never seen it before. I can't believe with all the Silverados on the road they have not seen this plug and don't stock them. Where can I get these plugs or is there a matching replacement? Thanks.

markp
barefootdiver2000@yahoo.com

AC Delco switched to Iridium (from Platinum). You want AC Delco 41985 plugs for your truck.

//2000CAYukon

Sometimes some spark plugs are discontinued and go up to the upgraded plugs.CarQuest did this on one AC Delco spark plug number already.

Yeah, Yukon is right. The plugs you want are AC 41-985. Same plug that I just put in my '02 6.0L. I got mine at O'reilly's, the ACDelco 12567759 means nothing, it's just the GM part#. They are spendy but you'll only need to change 'em every 80,000 - 100,000 miles.

Make sure you set the gap ( 0.060 ) mine were only gapped at 0.042 in the package.

so you have AC DELCO plugs made by NGK? or the other way around?

anyhow, I really don't know, and don't quite care how much iridium tipped ones are from one of those manufacturers. I use exclusively HALO plugs, for improved mpg, slight power improvement, and overall quality. also, I do not miss setting gaps, as they do not have any.

and no, I have no $$ interest in the product. just been using them for yrs on most of my vehicles.