So I had occasion to take off my valve cover and discovered that of the 15 head bolts that I'm supposed to have, I only have 14. The one that is centered front-to-rear on the head on the passenger side has gone missing. So I tried to see if one of the other head bolts would thread into that hole (just to make sure the stud wasn't broke off or anything) and discovered that that hole is deeper than the other 14...so what's the deal? Is this bolt special? I haven't had time to really research it and figured some of you guys would love to show off your knowledge of 2F engine hardware ;p