has any one used viton valve stem seals for the rs2000 if so where can i purchase them from in the uk, are viton better than standard
whats the width of the stems on the valves and are the exhaust and inlet side stem seals the same

 

Pretty much all valve stem seals will be viton as nothing else will take the temperatures.

 

The genuine items from ford are these viton may as well go purchase them
Are the inlet and exhaust side the same size