I primed my engine several months ago by driving the shaft with a drill. The motor is now ready to put into the car. I've decided to make a primer for this motor and others by making a tank with a pump in it. I'll make an adapter to drain oil from the pan into a tank with that has a filter and pump inside, sort of like a fuel tank with internal pump. It will pump oil continuously by pumping oil through a hose into the sending unit port and then it will drain back into the tank automatically via the oil pan drain adapter. I'll turn the engine a few degrees every few minutes to make sure the rocker shafts get their share. Should work on just about any motor as long as someone makes an adapter for the drain plug.