Abstract: An internal combustion engine structure in which the cylinder head and main bearing caps are linked by a framework of members including pairs of tension members each angled obliquely to the direct line between head and caps. The members of the framework are arranged so as to bear a substantial proportion of the firing loads of the engine in tension or compression without bending, thus relieving other parts of the engine, especially its outer surfaces, from loads under which they would tend to bend and thus emit noise. The framework may also serve to strengthen parts of the engine wall to make it less susceptible to bending.