A cylinder block of an engine, the cylinder block comprising: a cast body defining one or more cylindrical bores; a crankshaft bearing wall formed within the cast body, the crankshaft bearing wall configured to be removably coupled with a bearing cap to define an opening for rotatably supporting a crankshaft of the engine; and a first chamfered shoulder portion casted on the crankshaft bearing wall; wherein the first chamfered shoulder portion defines a clearance between the crankshaft bearing wall and the bearing cap; wherein the crankshaft bearing wall comprises: a first longitudinal coupling portion configured to be coupled with the bearing cap to define the opening for rotatably supporting the crankshaft of the engine; and a first lateral coupling portion extending from the first longitudinal coupling portion, the first lateral coupling portion configured to be coupled with the bearing cap, wherein the first chamfered shoulder portion is formed between the first longitudinal coupling portion and the first lateral coupling portion; wherein, in a use position of the cylinder block: the first longitudinal coupling portion includes a first horizontal machined surface configured to engage with a first mating surface of the bearing cap, and the first lateral coupling portion includes a first vertical machined surface configured to engage with a second mating surface of the bearing cap; characterised in that the first chamfered shoulder portion has a substantially convex shape having a radius. a cast body defining one or more cylindrical bores; a crankshaft bearing wall formed within the cast body, the crankshaft bearing wall configured to be removably coupled with a bearing cap to define an opening for rotatably supporting a crankshaft of the engine; and a first chamfered shoulder portion casted on the crankshaft bearing wall; wherein the first chamfered shoulder portion defines a clearance between the crankshaft bearing wall and the bearing cap; wherein the crankshaft bearing wall comprises: a first longitudinal coupling portion configured to be coupled with the bearing cap to define the opening for rotatably supporting the crankshaft of the engine; and a first lateral coupling portion extending from the first longitudinal coupling portion, the first lateral coupling portion configured to be coupled with the bearing cap, wherein the first chamfered shoulder portion is formed between the first longitudinal coupling portion and the first lateral coupling portion; wherein, in a use position of the cylinder block: the first longitudinal coupling portion includes a first horizontal machined surface configured to engage with a first mating surface of the bearing cap, and the first lateral coupling portion includes a first vertical machined surface configured to engage with a second mating surface of the bearing cap; characterised in that the first chamfered shoulder portion has a substantially convex shape having a radius. a first longitudinal coupling portion configured to be coupled with the bearing cap to define the opening for rotatably supporting the crankshaft of the engine; and a first lateral coupling portion extending from the first longitudinal coupling portion, the first lateral coupling portion configured to be coupled with the bearing cap, wherein the first chamfered shoulder portion is formed between the first longitudinal coupling portion and the first lateral coupling portion; wherein, in a use position of the cylinder block: the first longitudinal coupling portion includes a first horizontal machined surface configured to engage with a first mating surface of the bearing cap, and the first lateral coupling portion includes a first vertical machined surface configured to engage with a second mating surface of the bearing cap; characterised in that the first chamfered shoulder portion has a substantially convex shape having a radius. the first longitudinal coupling portion includes a first horizontal machined surface configured to engage with a first mating surface of the bearing cap, and the first lateral coupling portion includes a first vertical machined surface configured to engage with a second mating surface of the bearing cap; characterised in that the first chamfered shoulder portion has a substantially convex shape having a radius.