"Sandcast" refers to the FIRST 7,414 CB750 Honda motorcycles produced from early 1969 until September, 1969. "Sandcast" refers to the process by which each of the aluminum crankcase halves were cast. Literally, the molten aluminum was cast into a mold using a special sand formulated for the casting process. This casting process, using a sand mold, was a hand process, of the gravity type. The mold was created by packing the sand around a core, sometimes made of wood. After the sand was packed around the core, the core was removed from the mold by separating the mold, which was designed in two halves. "Sandcast", as generally referred to by "sandcast" enthusiasts, refers to the rough finish of the outer surface of each crankcase half. Please read carefully, contents of the Website. It can give you alot more info about what a "sandcast" is. Of final note, engine crank cases beginning with number 7415, used a mold not made of sand and the molten aluminium was pressure injected into this mold. These cases after 7414, had a very smooth finish.