  We present a new calculation of long-distance contributions to the K --> pi
pi amplitudes using the 1/N_c expansion within the framework of chiral
perturbation theory. Along these lines we compute the chiral loop corrections
to the operators Q_1, Q_2, Q_6, and Q_8. In the numerical analysis we present
values for B_6^(1/2) and B_8^(3/2). We discuss also the implications for a
theoretical understanding of the Delta I=1/2 selection rule.
