I dont know how someone could possible warp the manifolds by over torquing them. If they have to be torqued to 7 foot pounds (absolutly nothing) and someone torqued them to 25 id have to imagine the bolts would risk stripping out hole, but 25 shouldnt warp an intake flange, that is a flange thats worth a ****.

Id be willing to bet the heat from welding warped them far before bolting them down did.

Just my thoughts.