I was selling at a flat price until I found a yard that broke it into four prices HMS prepared/unprepared/motor blocks and case/sheet metal. Cast and blocks was paid the highest with sheet metal the lowest with a 60 dollar difference. So I found that even though it is a pain I gotta go through the scale more than twice to get the best price or lose 30-40 on a couple toms of scrap. They say they wholesale directly to the buyers so they must have it down. Good luck.