Rib structure on cylinder block

A cylinder block, comprising:

• a cylinder block body having a top surface, an inner bottom surface axially opposed from the top surface, and an exterior profile, the cylinder block body comprising:
• a cylinder opening disposed on the top surface, the cylinder opening having a cylinder axis;
• a first head boss disposed on the top surface, the first head boss centered on a first axis, the first head boss configured to threadingly engage with a first head fastener at a first initial position, the first initial position defining a first depth away from the top surface;
• a first main boss disposed on the inner bottom surface, the first main boss centered on a second axis parallel to or coaxial with the first axis, the first main boss configured to threadingly engage with a first main fastener at a first end position, the first end position defining a second depth from the inner bottom surface;
• a second main boss disposed on the inner bottom surface, the second main boss centered on a third axis parallel to the first axis, the second main boss configured to threadingly engage with a second main fastener at a second end position, the second end position defining a third depth from the inner bottom surface;
• a second head boss disposed on the top surface, the second head boss centered on a fourth axis parallel to or coaxial with the third axis, the second head boss configured to threadingly engage with a second head fastener at a second initial position, the second initial position defining a fourth depth from the top surface;
• the exterior profile defining a set of rib paths comprising:
• a first rib path extending from the first depth to the second depth;
• a second rib path extending from the first depth to the third depth;
• and
• a third rib path extending from the fourth depth to the third depth;
• wherein the first rib path and the second rib path include additional material having a first width, the first width larger than a second width of a wall of the cylinder block, the additional material extending radially away from the cylinder axis.