Ron answered with more detail them I but the fact is--if you understand the concept--static timing can be set to #6 as well. Just as with a 4 cylinder where the timing mark works for either #1 or #4 as they work in tandem. After setting the static timing it should also be checked running with a timing light. Running at 3-4 thousand rpm it should result in maximum advance of about 30-35 degrees. That test will tell you the centrifugal advance mechanism is working properly. - Dave