The 6.2 version is 1 3/4" I have a set on my truck and I have a second set of the 1-3/4" headers with the the y pipe for the 6.0-4.8 for sale in the classifieds. They measure 1.780" just to clarify. Also for anyone installing these headers you will need to move the harness that runs on the passenger side framerail to the starter. I had this get pinched between the header and framerail under a hard launch. It causes all kinds of electrical issues when it happens. It just needs to be moved forward a few inches. This may ot be teh case with all trucks but it has happened to a few of us.

 

Well they're all advertised and labeled as 1-3/4" primaries, but folks have actually measure them to be otherwise.

 

This won't fit a 4x4 NNBS, will they?

 

Yes, that is exactly what they are for.

 

Ohhhh my mistake! Someone had told me they didn't fit, thanks for the info!

 

I want 1 7/8 headers for mine.