The original Norton piston looks more to do with the steam age than modern items. I have invested in a Wiseco forged piston which looks a more serious a component. It was designed for a Triumph and the difference is obvious being the pin size and the compression height; being the distance from the top face and the centre of the pin. I can handle these issues however with a new bush and a longer conrod. The valve pockets are however a little high and  must deal with this .

 

 

 

The beauty of a modern high performance piston is beguiling.

 The standard of machining is space age. 

A work of art.