Anyone else had this problem? Is it from the expansion rates on the aluminum heads? I just put mine back together with Eddy heads and had my 340 Hi-po manifolds Jet-Hot coated, hoping I don't end up with this problem. Totally-Stainless carries a washer that is supposed to be vibration proof, but they are imported from Sweden and cost over $3 each, and you can't use any other spacers or washers with them unless you put one on each side of the spacer- could get pricey..