[Synchro909]

I time my touring engines the normal way, then go out on the road. At a steady 40 mph or so, I advance the timing till I hear the motor start to sound harsh, then back it off a couple of notches to where it runs smooth again. I note that position of the lever and don't diddle with it other than to start. I've found that works well regardless of what compression ratio head you are using.