I talked to a guy at Donnavon Racing today. He said although they have not filled any block he had seen the results of Riolo racing's filler and said it was pretty darn stout. He had nothing but good things to say about Dave Riolo and what he has been able to do with aluminum. The filler is also used on heads.

Still would like to see a pic or something of a block with this filler in it after a season of racing.

Leon