ust finished replacing all new head gaskets and everything went smooth on a buddy of mine's '98 sportey screamin eagle. Turned the engine over once we got finished and she cranked right up. Had a little knocking but went away but noticed that the rear exhaust was spitting. Saw that the top nut was loose and went to tighten and next thing you know, the header bolts just snaps. Any ideas on the easiest vs best ways to fix. Thanks.