Were you getting any steam from the exhaust? Probably not, if there was no coolant during the engine run(s). I'd suggest adapting an air hose with a pressure regulator attached to the radiator fill neck, and flowing a small volume of air into the radiator, then listening with a piece of rubber tubing used like a stethoscope to the spark plug holes, oil filler, crankcase vent, etc. for escaping air. You could also remove the valve cover and look for evidence of a water leak down the pushrod holes and into the crankcase that way. An incorrect fit of the head gasket between the cooling passages and the pushrod area would allow the kind of "quick fill" of the crankcase it seems you got.
Jerry
Last edited by Hotrod Lincoln; 12/15/2013 12:16 AM.