Sioux Professional valve seat grinder with all tooling,Grinding, Refacer and mea - $3,250 (Henderson) Up for sale is this excellent vintage Sioux model 645L Professional Mechanics/machinist valve seat Grinder / Refacer with Sioux 1710 high speed grinder, stem guides, pilots, stones, stone holders, stone dresser and measuring tool(s) cooling oil reservoir and pump included all on a nice …