With help from #2 son, installed the first two cylinders onto the engine. Installed hold-down nuts, but just hand-snugged, no torque. Installed new center through-bolts. Since the case is loose at the main bearing journal locations, cannot rotate the case on the crankshaft otherwise risk spinning a bearing. Need to lightly torque all nuts before I can rotate and bring the remaining two connecting rods out in the open.