I have tryed doing it by the service tech book called clymer for sportsters 1959-1985. My bike is a 77 Iron head. I had a head gasket that went bad. I replaced the head gaskets and the rocker boxes gaskets as well. I used 65 ft. lbs. of torques for the cylinderhead and 20 ft. lbs of torques for the rocker arm covers. SO when I went to start the bike, it would not start what so ever. Please can any one help me, is there some thing that I might have forgoten to do or may need to recheck. Thank you for your time in reading my problem and I hope that this may help some one when they may need the info.