A test I use to check rods is to bolt two onto a rod journal then pass a piston pin through the small end.. If there is any twist/lenght variance/pin hole anglularity the pin won't pass through both rods at the same time.. I was taught this while working on large Diesels & in that case there is a large end pin tool that is the diameter of the rod big end with no bearing so you don't need to bolt them to a journal just pass both pins through the rods.. You can check a full set of rods in five minutes easily..