In my opinion......repurposed parts look like **** on a car to be quite frank and although factory parts are better than cheap parts store trash they are NOT BETTER than high end parts that a person can purchase from whatever source he deems to be the best for his particular application. To quickly and easily prove your theory wrong what would fail sooner.....factory rocker arms or high quality like T&D or Jesel? How comfy would you feel with factory rods in your engine when you could have used high quality aftermarket pieces? Your argument has minimal at best merit.
