The next room in the assembly is the diesel room. Only 1 of the diesels is presented in the model, the real sub would have both a port and starboard engines. The following 7 shows variousw stages in the engine assembly. The total assembly used approx. 115 pieces, of which 42 are in the valve rocker arm assembly. These 4 pics show the block and head assembly, the details of 1 cylinder rocker assemblies, the completed rocker aqssembly from both the rear and front of the engine.