Oil leak behind the cam

BTW, when you prime it and try to get oil the the rockers, you need to turn the crank and stop, and then prime for many 20-30 seconds. It takes a while for oil to get to the rockers and fill the rocker shaft. If no joy, then turn the crank 15* at most and stop, then prime it again for 20-30 seconds. It can take a while to find the 2 spots that oil the rockers.