Another 273 commando build .. This one will be a "BEAST"

Take two forced air kerosene heaters , you know, 75,000 BTU jobs , and point them at the front and back of the motor about 2 or 3 feet away.Heat that mother up slow and steady for a good long time this way and then tap .The heat may break it free enough for the oil to seep in as the block expands . Do this outside !