i just changed my headgasket and put in studs. on cylinder 3 the intake rocker arm was removed before and got stripped. they used a helicoil to repair the threads. when i torqued that bolt it pulled out the coil. i then drilled it out and put in an insert supplied by the local machine shop. the metal of the insert got stripped by the bolt when i went to torque it< which is only 27 ft-lbs> does anyone have any suggestions on how to fix this. thanks.