Any idea on this? Basically, exhaust cam centerline is 115 degree. If I advance them, say to 119 (+4 degree) via adjustable cam gears, that will change the CAS position relative to TDC right? Base ignition timing is 15 degree (with stock exhaust centerline 115 degree). Since CAS is on exhaust cam, the ignition timing should be set to 15 + 4 = 19 degree. Does this sound reasonable?