I"m sure all of you are tired of tightening your manifold bolts, having them come loose, or cracking the flange when it moves around too much. I've tried everything I could think of from lock-tight (bad idea) to locking washing. Finally found something that works. Had the head bolts drilled through with a small hole and safety wired them with some stainless steel wire. You can find the wire at Ace hardware store. I think it's important to use a true stainless wire rather than an regular steel wire. Here is a pic, it's held up good so far. I initially tightened the bolts, when for a ride over typical bumps and rough roads. Tightened them down again and wired them up. Seems like a permanent solution.