I have had drain holes drilled on the bottom of my 72 and 90 Mac engines,,,,,,,,and had thought that I needed to drain the crank case when ever I flooded my engine,,,,,,but as the previous post stated,,,
pull the plugs, squirt oil into the cylinders, and this will sufficiently raise the compression, and even then after the prop has been pulled through several times to get the oil to sufficiently coat the jugs, then maybe squirting some fuel int the jugs and your engine should fire up. If you have spark, timing is at about 20-21 degrees before TDC, and you got fuel,,,,she will fire up ......IF,,,,,IF........the jugs are oiled up and the compression is sufficient.