I put new NGK tr55's in my 04 Denali today. My Question is .060 gap ok? That's what they were set at from Speed Inc. I'm sure there isn't going to be any gain with plug's, Right? I put new oem wires in also. It seems like the NGK's tr55's are the most voted, hope i was right?

 

i replaced mine with tr55's not to long ago gapped to .060 and everything seems fine, the price is 10x's better!

 

Your good to go man... i believe stock specs are .060...