In nature and in life, it is the combination of different attributes together that provide unique properties. This is the case in bamboo, in cork, and in fact in ancient Chinese philosophy of yin and yang. In this vein, dissimilar metal casting is a cost effective production method for making bimetallic composite components. By combining the strength of steel with lightweight aluminum (Al) specific critical sections of a component can be strengthened. The metallurgical bond between the steel and the Al has to be strong enough to withstand stresses related to solidification, residual stresses, thermal expansion stresses, and all other stresses coupled with the use of the component. The objectives of this work have been to develop a ferrous insert that promotes the growth of a strong metallurgical bond with the aluminum during the casting process.