no, use once only ,their designed to strech as they tighten, once used they dont tighten to the same extent , why risk failure of the head ,buy new ones
yes
not recommended
I would not recommend it. The bolts are stretched during the torque procedure.
You can, but I would advise against it. The old bolts have streatched and you should install new head bolts.
The head bolts will not have the same clamping capabilities, since they were stretched on the first installation. You may blow a head gasket due to the bolts losing torque.
Yes, if they are not damaged in any way.
According to my Haynes manual, 20Nm. Tighten to this force on the first cycle of bolts (in the correct order) and then half a turn on the next cycle, and then another half a turn on the last cycle.
Yes you never reuse headbolts
Does your rover 214 have a k series engine if it does it could be a problem with your head gasket
You can try to clean the head bolts using either a wire brush and solvent, a bead blaster or soda blaster. After the bolts are cleaned thread them into the block to make sure they turn freely. If there is any indication that the threads are damaged do not use the head bolts. Do not use a sandblaster to clean the head bolts since that will cause erosion of the threads, making the head bolt unusable.
Use a bolt extractor. It is not recommended to reuse the head bolts, that is why they are designed to not fit a 12mm or a 13mm.
11 nm then 2 x 180 degree turns