hey guys i am about to change my spark plugs and i was wondering which one of these three would work better. any comments or suggestions are welcomed.

denso iridium
http://www.densoproducts.com/more_info.asp?pid=9781

ac delco iridium
http://www.acdelco.com/parts/sparkplugs/iridium.htm

ngk iridium IX
http://www.ngksparkplugs.com/product...420&country=US

 

I've ran all three and there was no difference in them (on my truck) I run the stock A/C delco irridium plugs.

 

i have the NGK iridium ix

 

NGK tr55's were always a favorite with the LS1 crowd

 

Any one of those plugs will work fine, you won't feel a difference between the three. I'm a fan of Denso's myself mainly because I have around 15 years working for Toyota and I know that Denso makes good stuff. I'm running NGK TR55's now since they're dirt cheap (between 1 to 2 bucks a plug), and as mentioned above the LS1 crowd seems to love them. I tried them out as an experiment, to see if there would be any difference between them, the Denso Iridiums I had before, and the factory platinum AC Delco's my truck came with. All three seemed to burn the same, and provide the same power and mileage as far as I can tell. The main advantage of Iridium plugs is longevity, they should last much longer than copper and also longer than platinum. Denso also claims a more complete burn leading to less carbon build up...but I have no solid proof of that.

BTW, I wouldn't doubt if all 3 of those Iridiums are basically the same thing with different names stamped on them...alot of guys have changed their factory original plugs to find Delco's on one side, and NGK's on the other. If you're dead set on Iridium, I'd probably go with whichever one you can get the best deal on.