Cylinder head leak upper cylinder head bolt

Russel THis dosnt necesarely mean a corroded head stud..When the bolts are fitted u use a sealant on them.This with age could have given up.As a firt step u could try removing the head bolt(must degrease before refitting)and refit with new sealent(drain coolant before prosedure) This is a chance attempt that may well work and buy u time with ure engine.Worth a chance. If this fails then u need to remove the head on that side for inspection before a conclusion on the work to be carried out. DO NOT JUST TRY TIGHTEN IT! This will not work and will gust put more strain on the stud.