its not necessarily the same, yet you will need to reset the base ignition timing at idle when you adjust your intake cam timing. if not, you could be running as high as 22+ degrees if you are +4 on the cam. NOT GOOD. You would need to add a retard to your base ignition timing to put it back in the 16-18 degree range. The rod angle that makes good power is typically found from 17-19 degrees depending on where your intake valves are opening and the combustion is finishing. If you are tuning your cams, I am not sure how this effects the flame travel and combustion timing... yet this directly effects the power gains or losses made from ignition timing advance.