Dead on 2 and 4

It was suggested that I pulled the valve covers to check the rocker arms, and since I am out of my own ideas I went ahead and did so. Exhaust valve spring on cylinder 2 is broken. I guess that's why it took a couple of extra turns to get a good reading on the compression tester. Air pressure was closing the valve after a few revolutions. Still don't know about number four just yet, but I definitely have a good reason for number two not to fire