Hell, I snapped a damned comp stud made by ARP trying to torque it to spec. Those things are junk because they are a flawed design.
I decided to never deal with stud mounts on a magnum again and sprung for these...and the bolts they attach with gave me no probs whatsoever...They are a shaft that bolts to the head through a hard pedestal. And they are a nice solid setup for the magnum head.
These IMO are the best thing you can do for the magnum before dropping over a grand on a jesel setup. Very happy with them.