Question > with a BBC 10:1 93-pump gas, 049 iron heads, how much is too much advance?
If power/RPM's continues to increase from 35* to 38* should I keep sneaking up on total advance to maybe 40*? And also consider a colder plug?
I would not continue to increase TA if there was no power increase.
No way to hear detonation, it's all about reading plugs and seeing if RPM increase's at the tach.