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Knuckle castings for the automotive industry have traditionally been made from ductile iron, but engineers are now looking to aluminum castings as a lightweight alternative. Amcast Automotive has been involved in the development and manufacture of A206 aluminum knuckle castings since 1989 when it first supplied Aluminum castings for Ford Motor Co. (MN-12 platform). Recently, several new high volume automotive knuckle castings have been introduced using A356 aluminum alloy with T-6 temper. This paper presents mechanical property information on both A206 and A356 aluminum alloys to assist engineers in the design of knuckle castings in aluminum. In addition to microstructural evaluation, mechanical properties will be obtained from test bars cut from actual heat-treated knuckle castings.