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Nice work Steve Kim - as your question was a bit of two questions in one (one about this particular and one general) ->Generally all V-engines have a mirrored parts, though the placement is usually a con-rod offset between the halves (there are exceptions, with 'Fork 'n' Knife Rods').Inlets and Exhausts have different pressure and temperature -> bigger diameter on the Inlet ducts and valves and smaller diameter on the exhaust side -> optimum power, etc.
I am hoping to use brass liners in the cylinders.