David, The head bolts are no allen but triple-square bolts! I think they are 12mm or something... HTH, Mihnea At 14:05 24/11/2002 -0500, David Templeton wrote: >Hi all, > >I am in a bit of a pickle, I need to know what size allen socket to get to >undo the head bolts on a 5K head. > >Thanks >David A. Templeton >'85 5KS wagon