right i have striped her down this morning and on undoing the head nuts have found that the 5 studs on the inlet side of the head loose enough to wobble with my finger and the 5 on the zorst side are still in place (im thinking this is why it was leaking).Now on the instructions it advises to only do them hand tight and use the lube suplied but also says you can locktight them in is that advisable or should i put them in a bit tighter? I havent lifted the head off yet to inspect it so may find sumit els