[DanEC]

I anticipate he means initial timing which is all that would show at idle. But - it also depends on how your distributor is set up. My 427 dual point distributor provides 22 degrees centrifugal advance at the crank - so I run 14 to 15 degrees initial timing for a total of 36 to 37. I could go up a bit more with my modest compression motor but that's where it is for now. If you don't know the advance curve in your distributor then you should have it checked on a Sun machine or use a dial back timing light to time it so you don't end up with too much total advance.