I just synced a set of carbs for the first time and was amazed at how much difference an 1/8th of a turn could make to the entire motor. I'd say if it's running great don't worry about it but if you have any issues (weird idle, dead spots, etc.) get yourself a sync tool. I paid a $100 for a Motion Pro and it works fine. Others on this site hate that thing and if I had any experience w/ anything else I might hate it too but it worked for me. Now I'm about sync everything else I have and see what happens(3 other sohc4's and 3 dual carb vw's).