I just wanted to point out a good deal that I got on stock replacement spark plugs. Im not trying to contribute to the "best plugs" debate. Im just saying that this was a good price for the NGK LZFR5C-11 plugs that are called for in the manual.(2010 5.7). It seems all my local stores have been sold out of these, so I went online to find them. I found them on Amazon.com. they were $83.76 delivered from the one vendor. Thats $4.99 each. (and about $4 shipping). Everyone local wanted between $6-7 each (plus sales tax). I got a solid 50K miles on the original ones without any issue so I figured I would just replace them with the same ones. Here is the link, if your interested. And no, I dont work for them.LOL
Thanks for the find BobzRam. I did my plugs at 13K just to find out how tough it is as most others have commented. It wasn't bad at all actually and took me just over an hour. I bought 16 LZFR5C-11's with tax for 77.77 out the door at O'Reilly's. I had to wait a day because these plugs were stocked at a local warehouse but it was worth it. They didn't come gapped either so I pre gapped them prior to the weekend of installation.