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ALUMINUM engines promise a gain in the power/weight ratio and possibilities of production economies. Aluminum has already proved its value for some parts; only the adaptation of design for high production methods delays full realization of the metal's potentials. This paper describes the problems encountered in adapting the V-type engine to fabrication methods using aluminum alloy parts. Applications of aluminum in crankcase and cylinder block, cylinder liners and heads, intake manifold, pistons, and bearings are also discussed.