I think this has to be a fairly common situation, but I have only seen it a couple times. I have a 406 sbc, Dart block / heads. I picked it up fairly reasonable,and am dis assembling it, as it has some bearing problems, want to determine what can be re used. Here's the problem.....the head studs....the center ones...you can't get a 5/8 socket on them, due to the valve springs being too close. I had this on another motor, but was able to use a 5/8 12 point socket, which I ground down to get more room. This one....no chance. I can't believe that I will have to remove those 2 valve springs to get the head off. Any solutions? Thanks