Old Post, but That's how we did it back in the day. Dial it Up, then drop er a Lil, run her, listen well, then check for kickback at starter. If no Det, good to go!
I still do it like that. Mainly because I'm too lazy to get my timing light out. But it works, there's no denying it. Almost without fail, when I come back and recheck it with a light, it's right where it should be.
