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Only if they came with a 13" swing lathe thrown in as a freebee That will limit your market. 1/3rd scale may suit people more as that gives a 8 5/8" flywheel. Even 1/4 scale would work with a 5 1/2" flywheel and 2" bore
Maybe you did not put "castings" in bold enough print or perhaps a cross stich pattern of the engine would go down better