valve grinding machines - practicalmachinist. Feb 11, 2014· What would be a fair price for the machines if in working order? 02-10-2014 , 08 , You will need to check the condition of the ways and bearings in the grinding head and the rotating chuck that holds the valv , with a modern 4 valve engine the valve won't even be on the seat all the way around google a Rottler valve seat machine have a .