Eight S₇ white maize inbred lines were derived from selfing of S₅ inbred lines of two populations, i.e., Giza-2 and IW-469 were chosen to be used as parents of a half-diallel crossing and obtained on 28 F₁ crosses, which evaluated along with the 2 check hybrids at Experimental Farm, Faculty of Agriculture, Al-Azhar University, Assiut Branch in 2021 to identify the best parental general combiners and specific combinations to improve maize for earliness and yield. Results manifested that highly significant differences were detected among crosses for all the studied traits. Also, means squares due to GCA and SCA were highly significant for all traits. The ratio of σ²GCA/σ²SCA was less than one for all traits. The 4 crosses; P₁ x P₄, P₃ x P₆, P₅ x P₆ and P₇ x P₈ possessed desirable significant positive heterotic effects for increasing grain yield/plant relative to the checks SC-136 and SC-10, and among them the cross P₃ x P₆, also possessed significant negative desirable standard heterotic effects for tasseling and silking earliness relative to both the check hybrids. The parent P₈ possessed significant desirable GCA effects for grain yield and its components with silking earliness. The 14 crosses; P₁ × P₂, P₁ × P₄, P₁ × P₅, P₁ × P₈, P₂ × P₃, P₂ × P₈, P₃ × P₄, P₃ × P₆, P₃ × P₇, P₃ × P₈, P₄ × P₅, P₅ × P₆, P₅ × P₇ and P₇ × P₈ possessed significant positive desirable SCA effects for high yielding ability and among them the 2 crosses; P₁ × P₈ and P₂ × P₃, also possessed significant desirable SCA effects for tasseling and silking earliness.