half cylinders 2 from the longitudinal profiled section 6 hollow high profiled sections 15 lead via the cavity of the camshaft bearing alley 5 to the lower edge of the cylinder block 1 the vertical profiled sections 15 are arranged in the main bearing plane between two cylinders 2 the camshaft not shown is mounted in camshaft bearings 16 which for their part are connected to the cylinder block 1 by casting structures in front of and behind the sectional plane shown in the figure the lubricant for the camshaft is supplied through the bores 17 in the camshaft bearing 16 the tappets not shown for actuating the gas exchange valves are guided in the guides 8 and project out of the cylinder block 1 into the cylinder head not shown through the passages 9 the rectilinear profile of the high profiled sections 15 from the longitudinal profiled section 6 to the lower edge of the cylinder block 1 is interrupted by the camshaft bearing alley 5 in the region of the camshaft bearings 16 the vertical profiled sections 15 are divided in two which extend around the camshaft bearings as seen in the direction of the camshaft bearing alley 5 the bearing cavity is formed by one part of the vertical profiled section 15 extending in front of the camshaft bearing 16 and the other.