Hi guys, i have a 1967 Satellite with a 383 motor. About 5 years ago i had it rebuilt , boring out 30 thou and adding a livelier cam. I am using a Carter 650 competition carb , after the rebuild i set the advance timing to 10-12 btdc. my total advance was read ou at 36. The car seemed to like this setting and ran well on the street. I have noticed in the last few months that at low rpm it ran great but as i got up to 3000 plus it seemed to lag. I decided to reset the timing to see if it helped. I am now at about 16-20 btdc and total advance about 40. It is running great low end and top end. Any thoughts on why the change was needed.
