I have a Y block partially tore down. The rockers, intake, distributer, exhaust manifolds, and oil pump are removed. The heads are on the block. The engine is out of the truck. I want to see if the oil passages to the rocker shafts are open. Is there a way to do this without removing the heads? If they are plugged, is there a way to clean them without removing the heads from the block?  Eventually this engine will be tore down for rebuild, but not yet. I just want it running until then. If I shoot a little kroil oil (penetrating oil) into the oil passage on the heads, where do I look for it to exit?

Darrell Howard Whitefish, MT Outlaw 56 Ford F-100's