I got a new set of head studs and the nuts were wrong. There seems to be two sets of nuts for the studs. On the new set the washer part of the nut was too large. I got another set from a local shop and the washer around the nut was smaller by 2-3 mm. I am not talking about the washer set, but the bottom end of the nut. I could clear the #3 cylinder but #1, #4,#6 and #2 would not clear. When you put the studs in, you also need to put the washer in first then the stud.