hi guys,my mates in the process of stripping down my engine(sapphire cossie)but he can't get the cylinder head off,he's took the 4 cross type thread bolts off each corner but he can't get the other 6 out of the middle,think there the long studded bolts(can't get a socket to fit down the hole to get to the bolts,tried loads,think its an 18 or 19 mill)had 2 mates look at it who are both mechanics and they said they will have to grind down a socket to fit,surely there's one which will fit??how the fook did they go in in the 1st place ??

any one in the know?????at a standstill at the minute