Have you owned a rotary before? Could you say for yourself whether or not it needs rebuilding? Thats like being too pussy to get a DSM *just* because some of them get crank walk. Same could be said for MkIII Supras, if you are a fucking retard and dont retorque the head properly until you get a MHG and studs, then you're going to get a BHG. Its avoidable on MkIIIs, and (again, assuming your not a complete fuck) if you were to take care of your 13B, I'd think that you wouldnt need to rebuild it nearly as soon, if at all