Not sure what some of this has to do with the price of tea in China!? I can tell you on these heads now, with this cam, lifters, pushrods, 1.6 pivot/1.7ratio TD rocker system and 5.344 valve length with an .080" lash cap the centerline for the rocker bar hold-downs needs to move some away from the valve to allow for more lift. Getting the sweep adjusted optimal, moves the pushrod further into the head AND BOLT/STUD besides all that moving the centerline towards the valve compromises the angularity on the backside of the rocker. I'm probably sweating nothing here? but with open loads over 1000lbs and rpm over 8000, it isn't going to be a bracket build from my perspective.