I wanna porting my roatry by myself. I am new. I know and learn about port quite. But I don't know Which plate of rotary can I do my work? side housing(Extend port) or Intermediate plate (Primary Port) for stree port or extend port. Or need to do both.

 

Open all the ports as big as you can with out allowing seals to fall in the ports. Port the intake, primaries and sceondaries and the exhaust.