I have a set of XE pistons to go onto my zetec rods but what exactly needs to be done? I know that the little end has to be drilled out , but can't quite remember the size. also i recall the pin or piston needs drilling for some reason ?? Also does the little ends need brass bushing?

 

Ok, i have found the infor for the 21 mm drilling and that the small end needs a bronze bush but can somebody clear up about the drilling of the pin or piston for oil?