the belt should take it I would think. WHat could be happening is the superchargers are flexing down or the crank pulley is flexing up because of the load and tension. The size of the bracket you need to stop this flexing is actually big. The reasoning I have behind this is I am helping a guy working on a supercharged boat engine with a big ass blower with a serpitine belt on it. It keeps destroying the belt and we braced the blower and it improved drastically but not totally fixed. Upon further inspection the end of the crank was flexing up. So..... We are having a bracket made for the front of this setup that uses a bearing on the end of the crank to support the crank. this bracket is half inch billet and extends up to the supercharger where it is braced on the front also. Big production. The machinist we are using is talented and its costing about 5 grand. THe moral of the story is, you need lots of support. I don't think the diablo crank is designed to be loaded like that. The pulley is a fairly lightweight arrangement also.