Well I got the NGK Iridium plugs installed tonight, truck seems to have a little more Jazz to it, and also sounds like it's idling smoother. which are both good things,

the stock plugs were not that bad, but were warn to mabye half there life. prob could have gotten another 50k easy. but that's fine by me.

 

Did you pick your plugs up off of the NGK website? I have to replace plugs also so I'm gonna use your part number and try to find them. What did you end up gapping them to?

 

Not trying to hijack the thread but didnt want to start a new one on spark plugs.
Ok, I'm getting ready to do a tuneup and just wanted to make sure I get the right plugs. A lot of people talk about the autolite 3923's but when I look up my truck on the parts site's it list the 3922 but not the 3923. Is there a difference between plugs for the HO and NON-HO engines??? I have an 06 V8 Vin N.