E evil4g63 New Member Jun 19, 2008 #1 I'm curious to know if it should be polished to a mirror finish or do I need to leave some porousity in it. Also, what's the best rotary valve size for the 650 engine or how can I find out.
I'm curious to know if it should be polished to a mirror finish or do I need to leave some porousity in it. Also, what's the best rotary valve size for the 650 engine or how can I find out.
