 The two blocks were joined at an 82° angle using a common cast-aluminum sump that also carried a common oil supply for the engine.At the non-drive end another aluminum casting assured the alignment of the blocks while at the drive end a steel adapter fit the ends of both crankshafts.A sprocket and Morse chain from each crankshaft were connected to a shaft running down the middle of the sump that transmitted power from the left-hand crank to the right.