Well after some machining mods to my BROCKS CT SERIES header flanges , I am about to install these BEAUTIES- WOW I sure wish I could find a pair of headers this pretty for my truck.
Although Brocks says they had no issues with the flange nuts only engaging 2-3 threads in the nut- I was not comfy with that, so being the good Machinist I am, I opted to machine a small
.100" counter bore on them and they work perfect. Please see before and after pics below. I spoke with Brock and hope He will add this step in his CNC MILL program for the future.