All my kingsnakes are yearling or smaller.
I have personally held and helped measure a Desert Cali King at 55"
I have seen pictures of another Desert Cali King from a very reliable source that is in excess of 5 foot (biggest Cali I have ever seen)
If you want to measure your snakes and you have a digital camera, go to:
http://serpwidgets.com/Apps/apps.html
download the snake measurer program.
I have used it and several others I know have as well. It is BY FAR the easiest and most accurate way to measure any snake.