i've helicoiled an exhaust stud in the head already without any problems
not sure if it can be done for the cams as there is a need to keep the caps fitting exact/flush
no, was just winding it in, went to nip it up and it suddenly went slack!! done it loads of times before, but must of picked up on a thread and fucked it. well pissed off. i only had the sump to re-seal and it would of been running again.