I barely moved mine between my 2 year emissions test , and forgot how much and surprised myself when I reset it to 2 out plus half turn more . I had mine out 4 turns , ran great blew too much co .
From what I read on the net , the quality rebuilds and Edelbrocks usually have the APT 2 turns out when purchased , another half turn is perfect in my case ( well maybe perfect , retest next week ) .