if your standing in front of the car looking down on the timing mark the crank moves clockwise correct? so if your timing mark is showing 30 BTDC you would adjust it clockwise to get it to 15 BTDC, wouldn't that mean that you need to advance FROM 30BTDC to 15BTDC? that's how I've always understood it anyways, and if it's correct then 30 degrees before top dead center would be retarded from the stock setting. please explaine to me where I'm wrong here